Snowflakes are an item required to trade with in the Iceika dimension. You can use Snowflakes to make your weapons and tools stronger and better by trading with a Workshop Tinkerer or you can purchase miscellaneous items from a Workshop Merchant. Both Workshop Tinkerers and Workshop Merchants are found in structures located around Iceika.
Snowflakes can be found in dungeons beneath the surface of Iceika. In order to obtain the Snowflakes, the player must destroy the snow covered chests with a pickaxe. Snowflakes are not an easy resource to obtain as the dungeons contain multiple mob spawners.
It is recommended that you keep your Snowflakes and spend them on powerful items as they are difficult to collect.