My first dog I ever had would eat frogs
yuk! He was an outside dog and would find them in the backyard every now and then, and they would make him hallucinate. He would jump at the wall of the side of the house all night, after he would eat one.
He was a beagle/sheltie mix so he was medium sized, for a Yorkie I would be concerned because they are so much smaller, I would think the frog would have a harsher effect on them.