In the comics there were 3 types of zombies. The "roamers", which formed the herds. The, I forget the name, "sitters"? That would just basically not move until something got their attention. And the third type, of which I've also forgotten the name of, that basically just hung around a small area.
Depending on where they hang around, that would be either "Trekkies", "comic book nerds", or "gamers".