Oh yes yes, Cannibalism is the act or practice of humans eating other humans.
A number of stories in Greek mythology involve cannibalism, in particular cannibalism of close family members, for example the stories of Thyestes, Tereus and especially Cronus, who was Saturn in the Roman pantheon. The story of Tantalus also parallels this. These mythologies inspired Shakespeare's cannibalism scene in Titus Andronicus.
Hindu mythology describes evil beings called "asura" or "rakshasa" that dwell in the forests and practice extreme violence including devouring their own kind, and possess many evil supernatural powers. These are however the Hindu equivalent of "demons" and do not relate to actual tribes of forest-dwelling people.