"This coin can be exchanged for Yule Tokens at Albert Yule, the Town Crier in Winter-home.
It can also be given as a charitable donation."
This is also a reward from the deeds:
Frostbluff Flower-petals -- Tier 1
Frostbluff Flower-petals -- Tier 2
Frostbluff Rotten Fruit -- Tier 1
Frostbluff Rotten Fruit -- Tier 2