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Describe what makes them humanoid—"humanoid" does not mean Like Human Unless Noted, it means "something that has an appearance resembling a human". It's a nebulous term that only really means anything in context. In the middle of a bustling city, a gorilla isn't particularly humanoid, but in a setting full of lizards, a gorilla is the pinnacle of "humanoid-ness".
The page image for Horned Humanoid is a prime example of a "humanoid" that doesn't just look like a human with horns. He's massive, green, and hairy—and every example of a Horned Humanoid definitely doesn't look like that.
Also describe the horns. Are they obviously modeled after a particular animal? Are they black and curved like a ram/goat/devil, or white and conical like a unicorn?
You could also talk about what makes their Horned Humanoid status significant. If it's meant to paint them as being a demonic archetype, for instance, or a mischievous satyr, say as much.
Edited by SolipSchism^ More accurately, no trope is self-explanatory. Every trope has context, and every trope (with the possible exception of some gags) tells you something more than what the trope itself is. Those details are what makes the trope significant. (i.e., Horned Humanoid is "a humanoid character with horns on their head", but one Horned Humanoid might be a Petting Zoo Person while another is Satan while yet another is a Rubber-Forehead Alien). Context always, always matters.
I think a good illustration of just physical variation in similar descriptions is in the comic/graphic novel adaption of the first Mythadventures novel. The dimension of Deva is the crossroads of the dimensions and a 24-hour 7-days-a-week very crowded shopping and selling experience, so the illustrators really went to town on the variety of physical appearances in the different "demons" (dimension travellers). One look at the crowds show why just a two-word description will never suffice, just on the physical level.
Coming back to where you started is not the same as never leaving. -Terry PratchettPlenty of tropes are self-explanatory. Many Title Tropes, for starters. Name and Name, Character Name and the Noun Phrase, Verbing Nouny.
^^ Wait, what? My point was not to strip Verbing Nouny of examples, my point was that it's just factually incorrect to state that no trope is self-explanatory. The fact of the matter is that several tropes are self-explanatory. We treat the anti-ZCE rule as if Moses carved it onto stone tablets, when we'd be better served by admitting that the anti-ZCE rule should not be draconian and absolute.
^ The ZCE rule exists because every good trope has a context: it's not just a thing that happens a lot, it's a thing that means something when it does happen.
That applies to title tropes just as much as any other. For instance, The Crime Job is a trope not just because it's a commonly-used form of title, but because seeing a work with that title tells you something about the genre and likely mode that the story will be told in. So a good example wouldn't just be "This work is called 'The X Job'", it would be something like "This work is called 'The X Job', and is a caper movie about a ragtag group of thieves stealing from the X".
Pointing out that some of the pages listed at Title Tropes actually are just lists of things that happen a lot doesn't mean that some tropes don't need context — it means that those pages aren't good tropes.
Should Name and Name have a page or is there a way to give the examples context?
Character Title has it bad, too. The easiest way to add context here would just be to explain why the elements used in the title are important; if the work is called Alice and Bob and the Ultimate Trope, explain who Alice and Bob are and why the ultimate trope is significant.
Rocks fall, everyone miraculously survives.Pretty much, though noting how it relates to the work of course.
- Anastasia: The movie is named after the missing Grand Duchess, who the main character Anya is believed to be.
If you think the trope is so self-explanatory, and the way it applies to the work is so trivial and obvious that you can't even thing of a way of providing context, then maybe it's so obvious to everybody else as well that you don't need to list it as an example?
I'm thinking of tropes like Protagonist Title. It may seem obvious to you that House is named after the protagonist, and why it is named that way. But it may not be that way for people who are new to the show. Is it obvious to everybody that House is the last name of the protagonist? Can you think of anything interesting to say about the fact that the show is named for him only, and not for any of all the other interesting characters on the show? These are the kind of questions you need to ask yourself.
Edited by GnomeTitan

Are there some cases where Zero Context Examples are acceptable? For example, if you're on a character page, and you put for one of the characters, say, "Horned Humanoid." I mean, there's really not much more you can say about that - it's pretty much self-explanatory, right?