Those are muscovies the one looking at the door seen to be a boy since there is more red on the face , and there is another in the middle that looks like could be a boy as well, the one with the head up.
I grew up with muscovies and is really easy to sex them by face , boys will have more red flesh (caruncling) tan the girls, well that is for the more wild ones and the ones in South America where I grew up, here seems that the caruncla is less prominent in some.The other way to tell is by size by 4 weeks you can see the size difference boys are bigger. The boys will hiss while the girls will make little chirp sounds.
If they are mix they will not be able to reproduce, but you can still using the girls for hatching the real thing later on.They are the best moms ever.