Look for an extra "toe" or spur higher up on the leg. That's the only certain way to tell I suppose. Everyone thinks we have Toms because of the way they "present". They say that Toms have brightly colored heads and no feathers on them. My hens look pretty bare too, but have a few straggler feathers, and really hairy ears. The hens head can be very bright blue/red too when they feel threatened. Although, the only thing my turkeys ever wanted to be fierce towards was each other, or a dog. Maybe Toms are nastier as well? (but it might take some time for that to show, waiting for them to reach sexual maturity?) They show their feathers similar to a Tom display, puff up, and fan out their tail, with the wing tips to the ground, so...don't go by that to assume its a Tom.