* Two new outfits (male and female) with three different skins each
* Two new face paints
* New backpack: Shield
* New tree: Mistletoe
* New building: Meadery
* New farm decorations: Longship, Viking Fence, Viking Arch, Viking Column
* New house: Viking Longhouse
* New house decorations: Oak Table, Oak Chair, Antle Chandelier, Horn Torch, Bear Carpet, Viking Window
* New house door: Viking Door
* New house wall: Nordic Wall (with three different color variations)
* New house floor: Stone Tiles

More details on the official game page of Farm Together - Mistletoe Pack ...