I feed mine frozen bloodworms. I get a big pack at the pet store and when it's feeding time, I put a frozen chunk in a cup. With a turkey baster, I take water from the aquarium and put it in the cup. When the worms melt into pieces, I suck them up with the turkey baster and push a few out at a time in front of each frogs' face. They've come to know the turkey baster means food. You stop feeding them when they get a little pudge on their side. Not too big though. This way takes some time, but it really ensures they get fed right.