There's a cricket breeding article on Frog Forum: Frog Forum - Culturing Crickets - Care and Breeding of the Common House Cricket

What kind of tadpoles are you planning to raise? Some froglets start out very small, and it might be a good idea to try fruitflies as well as Ryan has suggested. Depending on the froglet size and the number you raise, it may be difficult to time the pinhead cricket production to meet the frogs needs: Frog Forum - Fruit Fly Culturing, Care and Feeding - Everything you need to know about Drosophila

Milkweed bugs looks like a somewhat novel small feeder that I'm going to try this summer when I get around to gathering a few adults: Frog Forum - An alternative to crickets and fruitflies - Milkweed bugs