I called one in with my voice while bowhunting in late October, I snuck closer judging by his gobbles, and finally he stood there going in and out of strut for a while. 20 yards away, but too thick to shoot an arrow. Finally got busted and he putted for 10+ minutes.
i have pictures of strutting toms from Nov and Dec. they can and will do it at any time of the year, same with gobbling. Some of the highest gobble counts i hear each year is the day of duck season opener haha
yes, they gobble and strut year round, just more often in the spring. I think it's for the hens in the spring, but more for each other in establishing the pecking order the rest of the year.