Yes, my cockeral, Moose, started crowing at 4 days old. He'd stand really stiff, stretch his neck out, then this little funny chick crow would come out. At first I could not believe what I was seeing. I betcha he finds his voice today and you hear it! It's really funny.
My black cochin bantam was full on crowing at three weeks.. Sargeant Henry. My two white frizzle roos were less than a week old when they were already chest bumping. They were means little buggers. Henry.. he was tough.. but kept the rest of us in line (I was not the alpha at the time). Roosters are frustratingly cute balls of fun and madness!!