Post a few pictures. Some people report having hens that "crow". I would think especially if the bird is still really young and you aren't experienced with keeping roosters/chickens it might be hard to tell the difference between a baby rooster crow and a hen crow? I think it's worth it to post some pictures and ask people to confirm....
He's crowing like an adolescent boy whose voice is changing- cock-a-doo-er, screech- hack flaps wings and struts, cock-a-screech, hack, hack. Maybe it is a stuck feather LOL. I'll try to post some pic this afternoon.