Can’t you boil it with the skin on? Isn’t that more collagen?
Discussion
So if you try to boil the feet with that outer, scales layer, it won't be able to get to everything inside. Thats at least my understanding.
Every tutorial I've found for turkey/chicken feet bone broth has involved peeling that outer layer off. Plus, that layer is kind of nasty from all the debris and such even after you rinse it thoroughly
But even after you peel that outer layer, you still have the number of skin layers below it. So my thinking is there are not many nutrients in those outer scales too