Three-Headed Jake is a customer at the Krusty Krab. He has no speaking lines, and his first and only appearance was in "Move It or Lose It."
Mr. Krabs commented about an unusual problem at the Chum Bucket, and SpongeBob thought he was referring to Three-Headed Jake, who ate at the Krusty Krab all the time.
Three-Headed Jake is a purple fish with teal-colored fins. He is seen wearing a mustard-colored shirt. He was eating a Krabby Patty in the episode which might hint that he is fond of them.