Males usually have a larger, longer snod. They will also go completely bald on the head and neck area whereas the females will lose only about 75% of their head feathers. Males are generally larger by comparison and have larger, more prominent carbuncles. It will still be several weeks or more before you can unmistakably differentiate between the two sexes. Oh, and males will usually start to 'strut' soon, but watch out cuz I had one once that started strutting and he turned out to be a she...lol!!!
My turkey hen gobbled and strutted hahahahah