Gender of two 6 month old bantam mixes

[Msyr]

We just purchased these two cuties. They're apparently both around 6 months old, and I believe they're bantam cochin mixes. I was fairly certain that both were pullets, until someone heard a crow. Now, we already have a 3 year old hen that attempts to crow, but apparently it sounded different this time. So I'm wondering if one of these is a hidden cockerel, or if our old hen is being weird again.

 

[GirlsHuntToo]

Pullets.

 

[JedJackson]

Yes, I agree that they are pullets.