If you are brain tanning the fawn, it probably won't soften the way a grown deer will. The same is true for bison calves. When they are finished, they usually have a kind of crackly feel to them such as you get with poorly tanned buckskin. I'm not sure why the baby critters don't tan as well, but this has been my experience. I am not trying to dissuade you, just prepare you. Plains tribes used them for berry bags, as do I. Theirs didn't come out soft either. They are pretty cool regardless! I cannot speak for the chipmunks. I've never tried tanning those before. Curtis