I'm thinking it could be a rooster. Although,hens do have combs,but they are quite a bit smaller than the rooster's. I think you should wait until you get further evidence such as crowing. :)
I have been creating a bucket on the counter top with celery, carrots, and basically leftovers from our salads, onions, banana peels, etc..... kind of like a homemade compost for my almost eight week old chicks. I've heard some of these things might not be OK to feed my chickens.... Is it????