You're going to have to wait for feathers for breed, and gender you should wait until they're 8 weeks at the earliest.
That said, the black ones are barred rocks (yellow feet and legs) or cuckoo marans (white/pink feet and legs). The two white will have to wait.
Thank you my guess for the dark ones was Plymouth rocks the white ones Idk there's a funny story for not knowing their breed in that pic I had only had them 3 days they are bigger now .