We don't have synonyms for snow ball yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are snowball, snowfall and snowbell.
°A ball of snow, usually one made in the hand and thrown for amusement in a snowball fight; also a larger ball of snow made by rolling a snowball around in snow that sticks to it and increases its diameter.
°A ball of snow, usually one made in the hand and thrown for amusement in a snowball fight; also a larger ball of snow made by rolling a snowball around in snow that sticks to it and increases its diameter.