I've had a hen that crowed before. It's uncommon, but it happens. She died later this spring, because a cat broke into the coop, & ate her. She was a Silver Duckwing OEGB that layed us tiny eggs every day.I think I'm leaning towards Cockerel as well. Trying to crow sounds nothing like an egg song to me.
The chicken in the photo doesn't have any signs of being a cockerel, some breeds of chickens will grow large redder combs before the males do. I have an EE that had a big comb since she was a baby.