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It is a big light red fish with small light green eyes, and has a big mouth with pointy white teeth, and in the mouth is also its tongue. The Frogfish's tongue is dark purple and resembles an old lady. It also has a purple feline-like creature called Mr. Whiskers, both of these creatures can speak. Mr. Whiskers is a cat-like figure which is part of the frogfish.
When SpongeBob attempts to grab the ice cream from the ice cream lady, he realizes it is stuck the arm. In fright, he bites the substance attached to the arm and starts running from it. The frogfish then reveals itself and chases the Patty Wagon, almost to combustion, but when it gets the wagon, it is 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 huge and then there's HUGE!."
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.
At one point in the movie, the Frogfish throws SpongeBob into the Patty Mobile with Patrick, Patrick says "Did you get the ice cream?" The Frogfish then uses the roar "dsposit2" from Doom.