Are there any uniquely Realmsian words for “snow”? Sure. See The Great Glacier 2e sourcebook. Also, in Sword Coast AND Moonsea North: "drift" is loose blown snow, "slarr" is snow with a slippery ice coating on it, and "harra" is sleet that freezes onto surfaces to build a granular snowpack. "Rime" used at sea as in real world.

— Ed Greenwood (@TheEdVerse) July 9, 2018