It depends on the age of the cham. If its a young cham, you can pupate silkworms into moths, hornworms into moths, blue bottle flies.
just dont do wild caught bugs because they can pass on parasites to your cham. as well as some may have been sprayed with parasites.
wild caught bugs can be fed off, but you have to catch them and quarentine them for several days to make sure they wont die.