Characters in a work of fiction name something exactly what it's called in Real Life.
Pretty sure we don't have this one...Or DO we? Needs more examples. A character's out in a big, bad, mysterious new world. Suddenly, a rabbit hops out, grabbing his attention. He expresses aloud his amazement at the creature, but pauses for a second when he realizes there isn't a word for it yet. What's he going to do? Well, he'll Call a Rabbit a Rabbit. Subject often to Fridge Logic (if there are no words for anything, why can they talk?), this trope is prevalent when characters encounter mundane objects or creatures for the first time. Compare to Call a Rabit a Smeerp and Call a Smeerp a Rabbit