Penanggalan

In the first anime, Penangalan appears as a serpent-like being, with a prominent snout with sharp fangs and a pair of eyes with visible pupils. Its body is rotund with numerous hair strands all over, along with its tail.

Within the fourth anime, Penangalan retains their appearance, now having green skin, its snout is still prominent, having smaller fangs now and its eyes have red sclerae with small black pupils. Its neck appears to be longer and its body is slightly larger, still retaining the numerous hair strands across it and its tail.

(Source: GeGeGe no Kitarou Wiki)