not necessarily the best for them.
I do however love using hornworms as hydration helper and medicine administering therapy.
The best care for chameleon is by having as much as feeder variety as possible without sacrificing the safety of your chameleon's health (for obvious reason we don't feed them scorpion, ladybugs, fireflies, and some insects obtained from pesticide infested areas).
I fed mine many insects:
crickets, locust, silkies, phoenix worm, hawk moth, silk worm moth, house flies, bottle flies, roaches, supers, mantis, and many others.
About 99% of them is bred and raised by insect farmer (not wild caught).
at that age you can feed just about anything you want so long as it is not on the toxic list. Meal worms are OK but in moderation due to the chitin content.
I totally agree with dodolah
VARIETY is important to the health and happiness of your chameleons. As many have said, You can feed yours a wide array of appropriate sized bugs.
I use: crickets, kingworms (aka superworms), Madagascar Hissing Cockroaches, Indian Walking Sticks (phasmid), silkworms, butterworms, Turkish Roaches, mealworms (yes, they're okay now and then - better if you breed yourself, and only offer freshly molted (white) ones as they're easier to digest), waxworms (treats only), hornworms (you would have to use small ones of course), grasshoppers, woodsows (aka pill bugs - and like mealworms these take longer to digest, so moderation is key), moths, etc.