Another word for half and half birds is Gynandromorphs. I posted this in another thread, you aren’t the only one whose ‘rooster’ laid an egg.
..Here’s the article
https://www.npr.org/templates/story/story.php?storyId=124529630
https://www.npr.org/templates/story/story.php?storyId=124529630
.... I do have a small coop I need to repair and can could keep him in to see what happens. Thanks everyone and have a great day!