Wow, that's very interesting. I have not had that happen to me. I'm glad you filled the hole. Do you have a wire basket you could invert over that spot? The dollar store might have some now as Easter is coming up. Put a rock on top of it to weigh it down. You don't want Mr. Toad to try digging where the eyes are to prepare a new hole.
They are great to have in your garden especially if you have slugs.
