Stan, more commonly known as, Silent Stan is a fish that does not have a mouth and hangs out with the other surfer 'dudes' in the island in the episode "SpongeBob SquarePants vs. The Big One." He plays the piano during the end of the episode while partying with the people in Goo Lagoon.
He is a mustard yellow fish with a orange dorsal fin, he has no mouth. He wears shorts. It is unknown why he does not have a mouth, although, where his mouth would be, there is a part of the skin which dips in.
I can turn into a skyscraper!
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