A Leyak from Balinese mythology; these beings are described much like the Malaysian Penanggalan and Taiwanese Krasue, detaching their heads and organs from their bodies to go flying. They're most often represented in art, however, as an iconic long-tongued, bug-eyed demon mask, especially their evil queen, Rangda, though I believe she tends to stay in her body.
I wrote a brief but slightly more detailed overview here:
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