Oh, The Frog is back!
This is where I heard the metaphor first, along with some other stories:
Invaluable Lessons from A Frog: Seven Life-Enhancing Metaphors by Olivier Clerc, Dr. Lewis Mehl-Madrona:
Olivier Clerc (the author) also has another book that is interesting in the context of recovery,
The Gift of Forgiveness (see also on Amazon).