There's an excellent ski term glossary here from the Tetonsandwasatch blog, which includes words for snow, some of which I find hilarious. Some of my favorites:
Chunder – Generally, chopped up, bad – even heinous – snow.
Corn – Granular snow formed by repeatedly melting during the day and
freezing at night. It’s generally icy at night; the ‘corn’ appears as
the snow warms with daytime heating.
Facets – Snow which has undergone metamorphosis, such that the
crystals are poorly bonded together. Often compared to sugar.
Glom – 1) A nasty condition in which accumulated material, usually a
combination of semi-frozen, frozen, and melting snow, sticks to
everything, particularly one’s skins as they attempt to ascend, thus
resulting in ‘glomming.’ 2) Amalgamation of various food items which
end up in the cooking pot on a camp stove. Best served with hot
sauce! To learn to protect against glom, look here
Graupel – Precipitation that is created by the interaction of droplets
of water condensing on a snowflake, creating a ball of rime. Best
represented by images of ball bearings or tiny styrofoam ball filling
Pow, powder – Snow of a low density. Has many names, types, and
varieties: gunsmoke, cream, fluff, air, bottomless, gnar gnar (often
used by powder technicians), champagne, and many more.
Rime – A type of snow that has typically been wind blasted into place
with such other factors present that it can hold on to vertical
Sastrugi – Snow that has been shaped and affected by the wind.
Snain – A barely frozen snow which is a lot like rain. Or vice versa –
a frozen rain that’s a lot like snow.
Snice – Snow that’s got plenty of ice content.
Snirt – You guessed it – snow that’s got plenty of dirt in it. Or dirt
that has a little snow upon it.