This custom is called "obake" (according to one theory, it is claimed that people originally disguised themselves as children with a child-like hairstyle called "obokami (お坊髪) (a hairstyle for children)," but the term was changed to "obake").
これを「オバケ」と呼ぶ（一説には当初は子供の様な格好をしたことから「お坊髪」と呼ばれ、それが「お化け」になったといわれている）。