In Fallout Shelter, ghouls are a type of creature that can be found in the wasteland. They are typically hostile, but they can also be recruited to your vault. There are a few different ways to get a ghoul in Fallout Shelter.
One way to get a ghoul is to find them in the wasteland. Ghouls can be found in a variety of locations, including abandoned buildings, caves, and the Glowing Sea. When you encounter a ghoul, you can either kill it or recruit it. To recruit a ghoul, you will need to have a high enough Charisma stat.