I can clearly see the snood development on the male, since I see no others, they must be hens, if you had more than one Tom there would be lots of displaying and gobbling by now.
Mine start it pretty young, some are a few days, most start about 2-3 months, mine only do it when the adults are out. Have you tried gobbling to them, the male should be starting, for some reason ours like construction sounds, hammering and drills.