The lizard-person is a green strange creature of South America. Dr. Magnus discovered him after his natural habitat was destroyed for a mining operation and he´s possibly the last of his species. He is intelligent and in the episode "Nubbins "he uses a coat. It´s unknown what its relation is with the other lizard-person of the Sanctuary Network. He´s a little frightened of strangers.
Will Zimmerman calls him Steve in the episode "Fata Morgana", we can assume that's the name given to him by the sanctuary staff.