Gender and Breed of 4.5 month chickens

[Billy Mahone]

Hello All,

Can you please help me to identify these 5 chickens which are all 4 and half months old.
First 2 and last photo is of same chicken. Thank you.

 

[LadiesAndJane]

Never seen birds that look quite like this. They appear to be mixes. They all look like cockerels.

 

[JedJackson]

Maybe Crevecouer/Marans crosses. The second black one might be a pullet, but the rest are probably cockerels.