I understand the reasons you said about the garter-snakes are not able of to digest the exoskeleton of the insects, so i understand that is not a good idea giving them in a future.

But curiously each fresh WC garter-snake i had keeped go inmediatly after the crickets just in the first moment they see them fall into their terrariums (since their very first minutes of life in captivity) without any doubts about to prey on crickets just as if the crickets were a common part of their own diets in the wild previous of their captive life. I don´t pretend to say that is right to give insects anyway to the garter-snakes, but ever i had observed this.

And is good to give them as food the captive breeded small arboreal green frogs (which have a dark mask on their eyes) that are sold in bulk in the reptile stores ?? thanks, regards.