Try feeding silkworms, hornworms, and phoenix worm to name a few. Silkworms are very good for chams and he will enjoy them. Hornworms should be fed as treats as phoenix worms should be to. For the superworms tilt the feeding cup toward him so the worm will try to crawl out and he will see him moving and strike. make sure the worm doesnt fall out though. Hope this helps.