Frank is a muscular goldfish, usually seen hanging out at Goo Lagoon. His first appearance was in MuscleBob BuffPants. His name was revealed in the episode, Slide Whistle Stooges. In The Fry Cook Games, he is scared and eager to get out of the arena, showing a wimpy side. Sometimes he's seen eating at the Krusty Krab such as in To Love a Patty. He is very buff. His color is an almost a bronze-brown color. And he wears a black speedo swimsuit. In some episodes, he has sort of "squinty" eyes, unlike the ones shown here.