I would use your tadpoles, if I were you. It is news to me if any of these frog species are toxic.
I have a good story. I once had a group of A. chlorechis babies that all accepted pinky parts upon birth, except for one little guy. He wouldn't strike nor bite anything, no matter what I did. I scented, tried lizard tails, fish, etc. I assist fed that snake for nine months and I started questioning why I was keeping such a "loser snake" alive that would have surely died already in the wild. I finally found some cbb baby green tree frogs at a snake show and my brother and I bought about twenty or so.
Now, this was a snake that I would have guaranteed that I could pick up, pinch between my teeth, shoot some hoops with, floss my teeth with and it would never bite. When I tossed in the little frogs the snake actually grabbed one out of mid air before it hit the ground. It recognized it's usual prey (that was alive) that quickly and it reacted. That snake went on to take to rodent parts and then full pinks with no problem. I think that we are forcing baby tree vipers to eat a food source that they are not preconditioned to accept.
I've got more on this if you have the time to hear it. Will run off to bed for now. Take care.
Derek