Hey, I went back and looked at some of my notes about ants that I had took while keeping them and I just wanted to correct myself on something. The carpenter ant wont sting, when it bites it injects formic acid into the wound to make it feel way worse. So please if you do decide to try some ants you may want to not put to many of these in there, if the froglets are that small and they don't get the ants they will fight back if threatened and if there is a few from the same colony they will defend as a team. I have seen them do it, I put probably a 1 inch junebug in my fire ant colony and the next morning its head was on the ground and they were crawling in and out of it eating its insides. And fire ants sting forsure, that's one of the reasons they are so bad when you step on a nest, they sting and release a toxin into the prey and they release pheromones to attract the others. Im just letting you know this because I know you want catch feeders and don't want anything to happen to the froglets. Even in small numbers some small insects like ants can pack more of a punch then we think. hope every thing turns out for ya.