FrankieBillySteve is trout who makes several cameo appearances, starting in the episode "Culture Shock."
He is a light olive fish with light brown fins and lips. He wears blue pants and a black belt with a silver belt buckle. He looks similar to Fred, and just like him, he says "My leg!" in the episode "Larry's Gym."
When he is driving by the Krusty Krab, the grill falls on his boat and explodes. Like Fred, he yells "My leg!" but he says he is okay. The grill then falls on him again and he says that he is slightly less okay.