Oh my, they are so similar to Hektor and Achilles, our Polish Bantam boys (I love them , and would never let go of them. They are so sweet and know me so well.)!
First one looks really pure polish to me, right comb, stance and feathering. Harder to tell with the second, but look really similar so assuming yes too.
Third, also pure very similar too I wold say.
I presume the cream one is also a roo as you say, but it looks so hen-like from that angle!
Are any fighting, crowing?
Yep they look about 5-9 months old to me. A closer pic of the others would hep to tell for sure, but, especially the first one, purebred I would say! You could sell them for breeding I think, they are lovely- looking boys!