1987-1996 animated TV series
The Footski is a Foot Clan hydrofaring transport vehicle.
Shredder, Bebop and Rocksteady ride footskis down the underground river in the Bye, Bye, Fly episode, and defeat the Turtles in a fight on the water.
In the SNES Teenage Mutant Ninja Turtles: Turtles in Time the Rat King was seen riding the Footski at the sewer-water.
A toy version of this vehicle was released in 1989.