wel, if you had frogs in there,they probably ate the crickets....garters don't eat insects, they are unable to digest the exoskeletons of insects....snakes can go long periods without food (depending on age and size) with no ill effects. How soon will you be needing the babies?? Scott Felzer usually has large numbers of babies. Here's a link to his site....
Scott Felzer's Garter Snakes, specializing in aberrant garters Check with him!!!!