Depends what you take cannibals to be. Hundreds of years ago, before ghouls were more tamed, they feasted on humans. They would kill them and eat them freshly. They would never eat a cold body. Everything had to be warm and fresh. And preferably young. The younger the human, the better.
Ghouls never have eaten another ghoul. It would be considered disrespectful to their Dark Lord, but there was also never a want to eat another of the same species.
