Put the crickets in the freezer for 30 seconds or so before dropping them in for feeding. Ideally you will chill them long enough that they stop moving but are still alive- then as they warm up and start moving they are vulnerable to even the most uncoordinated frog. Of my 2 adult Grays, one is an awesome hunter, the other less so. The less awesome one gets chilled crickets dropped in front of her if I've been concerned she hasn't been eating enough.