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The Frogfish's tongue is purple and resembled an old lady. It also had a purple feline-like creature called Mr. Whiskers, both of these creatures could speak.
Mr. Whiskers was a cat-like figure which was part of the frogfish. His name is known because the Old Lady said, "I'll let you pet Mr. Whiskers."
SpongeBob was ordering the ice cream and he discovered it stuck to him. In fright, he bit the substance attached to his arm and ran from it. The frogfish then revealed itself and chased the Patty Wagon, almost to combustion, but when it did get the wagon, it was eaten by a Giant Eel from the trench.
Stephen Hillenburg was fascinated by the habits of Frogfish, so he decided to add this one to the film.
If you look closely in SpongeBob's Atlantis SquarePantis, in the Snap Happy level, you can see a frog fish hanging to the ceiling, and SpongeBob states, "There's big and then there's REALLY BIG."
The bonus material on The SpongeBob SquarePants Movie reveals that the frogfish's tongue is an old lady selling free ice cream due to the fact by that being what would lure in SpongeBob and Patrick, as compared to the real frogfish having a tongue with the scent of fish food on it.
This raises questions whether or not snails are supposed to be cats, and worms are supposed to be dogs.