Hinata, Neji, Choji(ish), Kimimaru, Gaara, Kidomaru, Animal Pain, Enma, Jirobo, Tobi just to name a few. Those are more of the dedicated tanks that I have seen used. I don't consider clone users as tanks, as often times their clones can be used for tanking or swarming purposes.

^ Why I don't like clones as tanks. :handshake