Flower Beetles, Fruit Beetles, Weevil's, Ladybugs were on a diet chart, but there is alot of species in that genus and most lady bugs are toxic so don't try that one.
Snails, outside I would breed out first. They breed fast, have lots of babies separate the babies. Parasites, they can get Rat Lungworm, which they are intermediate host. Chameleons won't be a host, but in humans and animals it's been shown to cause issues.
The worm crawls into the brain, and then dies. In humans it can cause menegitis and in other animals it's found the same. Whether that would happen to a Chameleon maybe not, but still don't risk.