Wild foods are a great resource! Mother Earth News had a great article years ago on how to remove the tannin from acorns to use them in cooking, along with some recipes. I'm sure you could find it in an online search.
I researched acorns last year, as I wanted to experiment with them as part of my chicken feed, but we had no crop last fall. What I did learn, though, is that white oaks (rounded leaves with no points) have acorns with less tannins and red oaks (very pointy leaves) have more tannins. This also impacts the storage ability, as more tannins make the acorns keep longer. My plan was to make two bins with hardware cloth (we have lots of squirrels here!) and fill one with white and one with red, and use the whites first.
Also, they cross-breed, so it is good to do a taste test and you may find individual trees in your area that have nuts with less tannins.
Pigs will eat them as is, I've heard. Wild pigs in Florida practically live on them, but sometime the Southern acorn varieties have less tannins, too.