Frank is a fish who owns the Palace of Pranks store. He is friends with SpongeBob and gives him discounts at his store because he is the store's biggest patron. Frank sold the Invisible Spray to SpongeBob and Patrick for $1. Frank so far has only appeared in the episode Pranks a Lot.
Frank is a green color. He wears a blue shirt and has brown pants. He has short grey hair and has an eyepatch on his left eye.he also has an eyepatch.
- He is not to be confused with a cameo character also named Frank whose name is revealed in the episode: Dying for Pie.