The pupae will probably be pretty hard itself considering its sole purpose is to be a protective coating while the worm turns into a beetle. Although I do believe I've heard of people doing it here and there, I'm not exactly sure how that would turn out if you could even get your chameleon to be interested in it. I turn 12 superworms into beetles every two months and feed them to my cham. I've never had a problem with them. You can actually gutload the beetles because they will eat leafy greens. Sure they have a little bit of a hard shell, but a lot of the natural bugs a chameleon will eat in the wild are beetles. If you did turn it into a beetle and you were lucky, you could catch it right when it comes out. As soon as it hatches, the shell will be white and super soft for a few hours and will slowly turn darker and harder.