I don't know as much about chickens as many of the people who have already responded, but you might find this thread an interesting read. In your description of Speckles, you said (1) by far the largest in my flock, (2)makes weird noises, (3) doesn't crow or lay an egg. It rung some bells for me because I had just got through reading this:
https://www.backyardchickens.com/threads/i-have-an-androgynous-chicken.1504007/page-3#post-25190617
I have no idea if this relates to your chicken, but it may.
https://www.backyardchickens.com/threads/i-have-an-androgynous-chicken.1504007/page-3#post-25190617
I have no idea if this relates to your chicken, but it may.