trademarked/ copyrighted logo stuff is hard to find. if you chart it yourself, for personal use, you are in the clear, but I doubt you will find a free pattern or even a liscensed pattern for sale.
there are lots of software programs available for charting pictures, or you could just use some graph paper and colored pencils. Find a picture of the logo you like, and enlarge it, and lay a graph over it. then on paper copy over what color belongs in each block.
the NFL is pretty active on protecting its logos. licenses are not easy or cheap to obtain.
I have seen (licensed) NFL team fleece fabric at the fabric store: maybe you could buy some of that and edge it with crochet?
or you could just find the colors of the team and make a striped or granny afghan with the right colors. he will immediately know what the colors represent!