In Japanese folklore, what yōkai is a giant skeleton called?

In Japanese folklore, a giant skeleton yōkai is called a gashadokuro.

The gashadokuro is usually described as an enormous skeleton, far larger than a human. Popular accounts say it forms from the bones of people who died from starvation or in battle and were not properly buried. It is said to roam at night, producing a rattling sound before attacking travelers.

The image is strongly associated with ukiyo-e artist Utagawa Kuniyoshi’s nineteenth-century triptych depicting the skeleton of Takiyasha’s summoned monster. That artwork helped establish the familiar giant-skeleton appearance in modern representations.

Gashadokuro is sometimes treated as an ancient folk belief, but much of the recognizable visual tradition comes from later art and modern yōkai classification. It should not be confused with a rokurokubi, a human-like creature whose neck stretches.