If you have to force-feed, try nightcrawlers. They digest better than crickets and are easier on the frog after an impaction. The kind you can find in your wal-mart bait section are fine to use, jut check and make sure you don't grab a box full of dead ones! Plus, once it gets the end of the worm in its mouth, it'll usually keep eating so it's less stressful than force-feeding multiple insects.