The portrayal of Suwa Myōjin's enemy as a frog also hints at the deity's character as a serpentine water god. (As a point of comparison, the obscure snake god Ugajin was also credited with defeating a malevolent frog deity.) The frog god itself has been interpreted either as representing the native deities Mishaguji and/or Moriya, with its defeat symbolizing the victory of the cult of Suwa Myōjin over the indigenous belief system, or as a symbol of the Buddhist concept of the three poisons (ignorance, greed, and hatred), which Suwa Myōjin, as an incarnation of the bodhisattva Samantabhadra, his esoteric aspect Vajrasattva and the Wisdom King Trailokyavijaya (interpreted as a manifestation of Vajrasattva), is said to destroy. Folk belief has long held the god of Suwa Shrine to assume the form of a serpent or dragon. Consequently, the deity appears as such in a number of folktales and anecdotes. In one such story, Suwa Myōjin once came to Izumo Province in the form of a dragon so gigantic that only his head can be seen; his tail was still at Suwa, caught in a tall pine tree by the shores of the lake. The other gods, upon seeing him, were so astounded and frightened at his enormous size that they exempted him from attending their yearly meetings. Thus, the deity of Suwa is claimed to be one of the very few "kami" in Japan who do not leave their shrines during the month of Kannazuki, when most gods are thought to gather at Izumo and thus are absent from most of the country. The supposed tree where the dragon's tail was caught (currently reduced to a stump) is locally known as . A variant of this story transposes the setting from Izumo to the Imperial Palace in Kyoto; in this version, the various "kami" are said to travel to the ancient capital every New Year's Day to greet the emperor. Another popular story promulgated by wandering preachers associated with the shrines of Suwa during the medieval period claimed the Suwa deity to have originally been Kōga Saburō, a warrior who temporarily became a dragon or a snake after a journey into the underworld. Cracks and ridges that form on a frozen Lake Suwa during cold winters have traditionally been interpreted as the trail left behind by Suwa Myōjin as he leaves the "Upper Shrine" and crosses the lake to meet his wife enshrined on the Lower Shrine on the opposite (northern) shore.