Ahh, that must have been quite the experience. I'm sure they did a LOT better in your care than they would have done in the wild. You did a good thing, even if you lost one you shouldn't feel bad cause there'd be much more casualties in the wild. Even though it still does hurt to lose one when you care for them so much.
This makes me want to go out and catch, raise some tadpoles next spring.. it'd be cool to find some Gray Tree frog tads, even though toads are quite awesome. They've always been a favorite of mine they have such cool personalities.