Crickets should be the main diet but variety is always best. Locusts are an excellent option if you have them accessible to you. Wax worms and meal worms should be used only for an occasional treat and not fed regularly. Wood lice is another good one. Roaches another one. Just avoid anything with a hard exoskeleton as they can be hard to digest. Make sure the size food item is not bigger than the space between their eyes.