nightcrawlers work like a charm. smooth, wiggly, and nutritious. go to walmart in the fishing/ sport department and look for a little refrigerator. they will have canadian nightcrawlers. open the container up and make sure it smells earthy. (sometimes worms can be scented) wash them off when you get home with dechlorinated water and offer them to your frogs. you may have to wiggle them around a bit to look more appealing