Other than Peetie, The Island of Misfit Mascots is the living-place of several other mascots, all of whom supposedly have a lesson to teach, and none of whom are actual real-life mascots. Some of them have only a few lines of dialogue, the rest don't have any dialogue at all, and their names are not mentioned.
Images of the Residents
Willy the “don’t stare directly at the sun” worm.
Oinky the “run around with scissors” pig.
Hoppy the “don’t do stuff that might irritate your inner ear” badger.
A few unnamed mascots, behind Petey
Several more unnamed mascots
Jimmy the “don’t hold onto a large magnet while someone else uses a fan nearby” falcon, after killing Kenny in demonstration.