Ah, there's nothing wrong with a few mealworms every now and again (better than waxworms!). At least they will eat anything so you can gutload them nicely.
They really shouldn't be all you have, but if it's an emergency then give some (maybe up to 5? depending on how big your cham is now - I am going by profile picture).
I look at them like a bag of crisps (or chips for you Americans).