An ancient tradition of Alolan festivals, still carried on to this day, is a competition to slide Sandshrew across ice as far as one can.
– Pokémon Moon Pokédex
Alolan Sandshrew is Ice/Steel type, which is a type combination unique to its family. It’s not the greatest type defensively, being 4x weak to Fire and Fighting. Despite being no longer Ground type, its name is still Sandshrew (in Japanese, its name is still Sand)
It seems to be based on an igloo. According to its Sun Pokedex entry, it can’t roll its body up anymore due to its hard steel shell.
Stat-wise, it has good Defense and Attack, but low other stats. Compared to Kanto Sandshrew, it trades 10 Sp Attack for 5 in each of its defenses. It’s not a bad trade, considering its Sp Attack is already low to begin with. It only has 40 Speed, but its Hidden ability, Slush Rush, doubles its Speed in Hail. Slush Rush is unique to Alolan Sandshrew family; it’s basically the Hail version of Sand Rush/Swift Swim/Chlorophyll. I find it odd that it took them until gen 7 to add it.