The octopus quintuplets are characters who first appear in the episode "Sailor Mouth."
The boy octopus children are colored purple and wear red and blue propeller hats. The girl octopus children are colored light pink and wear red, pink, and light blue bows. They each have one tooth.
While SpongeBob is swearing through a microphone and everyone gets shocked, the octopus quintuplets are laughing at SpongeBob's actions. However, they are stopped by their mother. One keeps laughing, until the mother puts a cup on their head.
"The Inmates of Summer"
One of the boy octopuses appears as a Sun-N-Fun Island camper.
"Hello Bikini Bottom!"
One of the boy octopuses appears at the birthday party that SpongeBob and Squidward are scheduled to perform at.