I have never seen any literature supporting the need for amphibian supplementation. If you have an eastern that is hitting mice, keep it that way. Keep mice in your hog's belly, and keep the frogs in the wild! Do a search on the forum because similar questions have been asked and discussed.
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*Humans aren't the only species on earth... we just act like it.

".the oldest task in human history: to live on a piece of land without
spoiling it."
Aldo Leopold (1938)

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