Acorns Valheim 1.0.20
Acorns is a crafting material that stacks to 100 in Valheim. It is used to build Birds' Nest and Oak Sapling.
“Plant them to grow an oak tree.”
Acorns are a material in Valheim. The in-game description says you plant them to grow an oak tree. Each Acorn weighs 0.1, and you can carry up to 100 in one stack. Acorns can be teleported, so they can go through a portal with you.
Acorns are used to build two things: the Oak Sapling and the Birds' Nest.
Used to build
Other material items
Amber, 
Amber Pearl, 
Ancient Bark, 
Ancient Coin, 
Ancient Metal, 
Ashlands Gourmet Bowl, 
Ashwood, 
Asksvin Bladder, 
Asksvin Hide, 
Asksvin Neck, 
Asksvin Pelvis, 
Asksvin Ribcage.