Dino Sponges is a sponge dinosaur.
Bart bought this toy for five dollars and tried to play a prank with it on Lisa. He laid a sponge dinosaur on the ground and called Lisa. He imagined himself spraying the dinosaur with a hose, making the dinosaur grow up to an immense size and chew Lisa. Unfortunately, Lisa came there and Bart sprayed the dinosaur, only to send it down the sewer grating.