Hedvig Fishtrap is an alter-ego of Squidward who appears in the episode "Sold!"
She is an octopus who has long, stringy hair (made out of the bottom of a mop) and wears purple jeans and brown boots with heels. She also wears a pink scarf and a blue headband. She wears a yellow top.
After Squidward plays the electric clarinet for Patrick under the guise of a rockstar, he doesn't change when he rushes back to SpongeBob's house, and so SpongeBob mistakes him for Hedvig. At first, Squidward is confused but he then catches on, feeds SpongeBob trash, and puts him outside.