Elephant fish

A Sea Moyster is a monster who appeared in the episode "Prehibernation Week". When Sandy ordered the other people in town to go look for SpongeBob she told the other people to check inside a moist cave she found. But the moist cave was revealed to be the elephant-like trunk of a hideous monster with green skin and three eyes.

Trivia

• Due to having a trunk like an elephant, Sea Moyster could be an elephantfish, or possibly a spoof of it.