Several years ago we were ice fishing and the walleyes were erping up whole frogs. We were fishing shallow in the evening. I figured they must be going after the frogs down in the mud, because they hibernate in the mud during the winter.
What I did was went to a biology supply website and bought little jars of 2-3" frogs that were preservative free in plain water. I used them with out success. Later I figured that in order for the frogs not to spoil in the jars, they must have "canned" them, so they were most likely cooked.
If I had to do it again, I would just catch them, pith their brain with a nail and vacuum seal them...or just vacuum seal them live and then freeze them. #froglivesmatter