What martial art does the Teenage Mutant Ninja Turtles do?

Answer 1

ninjutsu(Nin=Stealth, Perserverance n Jutsu=art of, way of)

The art is real which started in as secret societies during Medieval Japan only used by people who were part of a ninja clan and now made famous by Masaaki Hatsumi and practised as a martial art around the world but still very few.

Focusses on escape, preassure points, stealth, dissguisse, empty hand combat, ken(sword)jutsu, naginata, shurikenjutsu, bo(staff)jutsu, explosives(smoke, light bombs), using japanese farming tools as weapons(since most ninja were only farmers and only samurai were alowed to carry weapons), desguissing weapons as farming tools, etc.