Depending on the source of tadpoles that LMB you drop in may not eat a single one. Certain tadpoles secrete a toxin which is why fish do not eat those tadpoles. In our pond I've seen no fish go after the tadpoles ever.
I have never witnessed one of my fish using American Bullfrog tadpoles as forage - I literally have tens of thousands in my ponds. If they did, my fish would all have WR of 150+.
Many men go fishing all of their lives without knowing that it is not fish they are after. ~ Henry David Thoreau