The question is, are the parasites found inside those WC vertebrates in fact spreadable to our snakes? That's not a poke in the ribs to Stefan that's just a serious question I have that I am having trouble finding answers to... worldwide, you are totally right, they're not doing well on a global basis. BUT, in my backyard, with all this rain I can't even take a walk outside without accidentally smooshing a baby toad or frog... so if I need to use a few to get a picky eater off the ground, I do! I don't use them as a steady diet though as there is really no reason to. Garters are easy to switch onto other already dead preys and I don't enjoy decimating wild populations of frogs for my convenience.

I forgot to say to the OP that overall, I would recommend switching to a more reliable, non- wild caught food source. By taking so many you are unknowingly taking the frogs that could have fed a hungry wild garter for a day. Even if there's an abundance, It's still one less frog that is removed from the population, and good hobbyists generally try to avoid doing that unless they have a snake that will starve without a frog to eat. Even then, we generally use frogs/salamanders and quickly switch over via scenting. I would only use them while it's absolutely necessary and then make the switch.