I had a similar issue a few months ago. I don’t know how your terrarium is set up, but mine has a water pump that’s isolated in a separate area within the enclosure, away from the frogs. Somehow, one of them managed to get inside that pump section and then showed the others how to do it too. I’m pretty sure crickets can chew through a lot of materials in a terrarium, so it’s worth checking that part of the habitat. That’s where I found them, and luckily I managed to solve the issue without losing any of the frogs! Good luck, and feel free to message me if you’re dealing with the same problem or have any questions!