Froslass is based on the Japanese legend of Yuki-onna, a ghostly maiden who haunts snow-covered areas. Legends of Yuki-onna vary from one another a fair amount. Some describe her wearing a white kimono, others describe her being naked, with only her face and hair visible while the rest blends in with the snow. In all tales of her, though, she is a tall, beautiful woman with long black hair and pale, almost transparent skin.
Traditionally portrayed as the spirit of a woman who perished in the snow, Yuki-onna’s behavior usually revoles around killing lost travelers in snowstorms, often through seduction. One of her most iconic and frequently-told methods, however, is to appear to a traveler as a dying mother, holding a baby. If the traveler takes the baby from her, she will freeze them in place. She has a more gentle side in some legends, however, sometimes sparing her victims for various reasons. In one story, she spared a boys life because she respected his youthful beauty.
Legend of Yuki-onna are very prominent ones in Japan, and are worth a read. The legends surrounding it make it a great and abstract choice for a Pokemon.
The Charybdis was once a very beautiful Naiad, the daughter of the sea god Posioden and the earth goddess Gaia, who was transformed into a sea monster by Zeus. In some variations, Charybdis was transformed into a whirlpool, rather than creating them.