Darkling beetles and mealworms aren't the best for a young chameleon. They aren't very full of nutrients and are super crunchy.
Look for banded crickets in particular, in my experience they are easier to keep alive and are less smelly than other cricket species. They don't get as big as other commercially available species though.
For young or small chams phoenix worms (black soldier fly larvae) ate fantastic, they move a lot, are soft, and full of nutrients. Also roaches, silkworms, mantids, stickbugs, and hornworms are all good feeders. It is best to mix it up and make no single feeder more than 40 - 50% of total diet.