I had the same thing happen, supplier emailed me and said to pierce the worm before feeding it to my toad. I had a thread on this issue.
Quote Originally Posted by Mentat View Post
If frog is eating well... feed her! Think frog might be defecating in substrate and you could be missing it? Mmmm did she actually pooped half alive Phoenix worms? That is totally weird that they survive her intestinal tract... strange .