Freezer burned meats do have an off taste. For example, as teenagers, my best freind and I decided to get into our little boat, cross the river (big river, 35 foot deep and more, and 3/4 miles wide) and make a makeshift camp for the weekend on one of the little uninhabited islands. We made our camp and built a cooking fire to roast a chicken over it that we'd pulled from my parents, chest freezer. We made a spit out of willow branches and two forked branches to hold the spit. We roasted it carefully, and seasoned it with S&P. The bird had been freezer burned.
One bite and we gave the rest to my buddy's dog. The meat was not spoiled. It tasted bad and the dog would't even eat it. We had spuds, a knife and some bacon fat we'd brought along. The cast iron pan we'd brought did the trick and we had American fries for our dinner.
If the food is badly freezer burned, I would chuck it into the woods and let the wildlife have it. That- my opinion, based on past experieces with freezer burned chiken, and rabbit.
Seeeeya, Chief Longwind of the North