Are my silkies really pullets? Or cockerels?

[Blessedmamaof6]

I bought some silkie pullets off of a girl who was selling them on Facebook. She didn’t tell me how old they were but they were off heat and I’m guessing they were about 6-7 weeks old. So, that would put them about 9-10 weeks old, but I’m just guessing. I picked them up at her farm and she claimed they were pullets. I’m worried that they’re cockerels, but I don’t have any experience with silkies.

Here’s the first one:

Here’s the second one:

They are pretty aggressive with my other chickens sometimes, especially the roosters, and they won’t let others push them around. What do you think?

 

[nuthatched]

Not purebred and likely cockerels.