The ferry worker is a character who appears in the episode "The Whole Tooth."
He is a light green fish who has light blue wings and wears dark blue clothes and a dark blue hat with a tooth on it.
Role in episode
When the Tooth Ferry comes to the port to pick up Patrick's baby tooth, he is the character who takes the teeth onto the ship. He is shown to be tolerant of the teeth, and it is implied that he finds them cute.