I've Fed mantids to my chameleons. And many species realy love them. I've feeded several species. I also tried to breed them as a feeder. But that was not realy possible. It's so much work that there was no time left for my chameleons.
When you don't have many chameleons and you also like keeping insects it's an ideal foodsource.
And I also feeded adult mantids, even hierodula grandis.