My Beardy Boy will often come when I call his name in a certain voice. I believe it's mostly food based reinforcement, as he associates me with food. When I walk near his terrarium, he always watches my hands to see if I have food for him. He's really quite intelligent for a small animal, and learns from past experiences. My favorite example is that of mirrors. The first time he saw one, he did some head bobbing and ran into the mirror, thinking it was a competing male. Now he sees it, perks up, then lets his guard down and walks behind the mirror to make sure it's just a mirror. No more aggression, just curiosity. Rather fascinating to see him learn that it's not a real dragon.
As for tricks beyond getting them to come to you when called? I don't think I've seen any instances.