Tonfa (トンファー tonfā) are a weapon of Okinawan origin. They are wooden cudgels with handles at the side.
Raphael used tonfa as his training weapon in The Passing. Michaelangelo brandished them in Ninja Turtles: The Next Mutation as his normal weapon due to censorship in Europe which led to his 1987 counterpart not using Nunchakus in the European airings of the 1987 TV Series & the same for his live action movie counterpart as well. Raphael is seen equipping them amongst many other weapons in Showdown, although he never seems to use them.