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With a bit of Googling, I found a DS game called "Teenage Zombies"
. It seems like what you're looking for.
Whoaaaa, it was a game. Judging by the screenshots, I think there's a reason I've never heard of it beyond ads. I remember it being more Gorillaz-ish, whoops.
Thank you so, so, so much supergod, I kind of feel like an idiot not finding it faster with a name like that. Gotta learn to google better, I guess.
Okay, this one is going to be weird, because I actually can't remember for sure what type of media it was. I'm going to mark it as 'literature', because it being an illustrated book or graphic novel seems more likely than anything else.
I remember seeing a bunch of print ads for something about this group of zombie kids. Judging by the age I was around the time, it was probably aimed at children, and not an adult thing with a cartoon-ish style.
The style looked a LOT like Gorillaz, but I can say with certainty that that is not it. Just a very similar style, and similar looking characters?
I don't remember a ton about it, since it was just a series of ads I probably saw at bookstores, but I remember one of the zombies had no legs, and they pushed themselves around on a skateboard instead.
I remember getting a little insert ad for it in something I bought. That's why I'm having difficulty remembering for sure if it was a book, since I really remember it being a video game I got it out of, but it was more likely a book since I'd know if there was a game series like this. I can't remember what book it would have been in, though.
This would have been like 2005-2010 or so, and I'm just really curious what it was, since all I ever saw was ads.