Yes, you have a lot of cockerels. Different breeds mature differently, but those red combs are a giveaway (not to mention the crowing). There are also saddle and hackle feathers on some of them that say cockerel. I have had hens crow, but it's never as clear as a cockerels crow, and it is usually only for a short time or only very occasionally. And never more than one or two. They usually sound quite hoarse and choked. I suspect that all your crowing birds are cockerels. If you post individual pictures showing good side head shots, and full body from the side, you can get answers on particular ones.
The last picture posted, the front bird is a cockerel, I suspect the back left one (red/gold and grey) is too, back right is probably a pullet.
The last picture posted, the front bird is a cockerel, I suspect the back left one (red/gold and grey) is too, back right is probably a pullet.