Nope, sorry it's not a Tuatara. But you are right, Tutataras are not lizards. They're in the order Sphenodontia while the lizards are grouped in the order Squamata along with snakes. So I guess I narrowed this down. It's a lizard. 

any clues to where it lives, sometimes i look at the plants but im pretty sure those are plastic lol
cyclurus?