Wendigo is what we used to call a lake trout/speckled trout hybrid when they occurred naturally in Georgian Bay. The Ontaio government called them Splake (speckled/lake) when they bred them and stocked them in various Great Lakes. They were very rare when I was a boy in the '60s, and I caught only one incidental to Perch fishing, but that was before the stocking programs. It was great eating, so family lore says. The stocked variety, later morphed to lake trout backcross, and they weren't as good on the line or in the pan, though better than fishfarmed fish. They also didn't breed well on their own. I've heard the word applied to spirits also, though I'm no expert on the matter.

Peace, Mooh.