@indigomoth - They are actually not that bad. They taste a little bit like sweetbreads if they are cooked properly. People get too hung up on what they are eating instead of focusing on the taste.
Although I've never had turkey testicles before, to be fair. It seems like bull and ram testicles are much more popular. I know that during the lambing season, when they cut the little male lambs to make sure they don't turn into rams when they are older, the farmers don't waste the testicles, they have a fry up with them at the end of the day.