5 week old chicks, gender and breed?

[FattyChickens]

When I first bought them, the lady present said Bantams. Then I was doubting so I called the store and the lady that owns the place told me that they were jersey giants and gold stars. I've done a lot of research on gold stars and hardly anything pops up, it's genuinely annoying lol so idk if "gold star" is just some weird term hardly anyone uses, so I'd love to know what breed you guys think they are?
I also feel like they're growing slowly and are pretty small for 5 weeks old, there's a notable lack of comb growth

1. chirps
2. biscuit queen
3. crow
4. swan
5. penguin

I'm also confused about the long 2 tail feathers coming out of chirps bc that tells me rooster but if they really are the golden sex link, then she should be a hen.

 

[JedJackson]

The black ones could well be Jersey Giants, and the buff ones could well be Gold Stars, which is just a brand name for red sex links. They do look a little paler in color then most red sex links, but I'm not sure what else they could be.

As for gender, there are no signs yet of any of them being cockerels. If the lighter ones are Red Stars, then the coloring means they are pullets. Watch the combs on them all, and repost in a few weeks if you still have questions.