This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Jenglot (Java)
A jenglot is a small creature of Indonesian culture and mythology. It has the appearance of a deformed humanoid doll and whose size is up to 4.7 in in length. They have long hair which grows sparse and stiff through the legs, and long nails. The doll itself does nothing, but when imbued with black magic, is said to provide protection to its master, takes revenge on an enemy or works as a good luck charm. It can fetch thousands of ringgit or millions of rupiah when sold.
Folklore states that they were formerly human beings. Jenglot 'keepers' feed their creature with blood, either animal blood (goat) or human blood. The blood is placed near the jenglot, which is said not to drink the blood directly. According to traditional belief, the jenglot will get the nutrients of the blood in their own way.