Birch frame. Beware of termites.
The item id for Frame Small Birch in unturned is 1067. You can use this ID with the commands below to spawn the item, give it to a player or buy it on a modded economy server.
Useable: Barricade
Build: Freeform
Size_X: 1
Size_Y: 1
Size_Z: 0.35
Health: 100
Range: 8
Radius: 0.25
Offset: 0.875
Explosion: 28
Blueprints: 2
Blueprint_0_Type: Barricade
Blueprint_0_Supplies: 1
Blueprint_0_Supply_0_ID: 62
Blueprint_0_Supply_0_Amount: 2
Blueprint_0_Build: 27
Blueprint_1_Type: Barricade
Blueprint_1_Supplies: 1
Blueprint_1_Supply_0_ID: 1066
Blueprint_1_Supply_0_Amount: 1
Blueprint_1_Products: 4
Blueprint_1_Build: 27
PlacementAudioClip: Sounds/WoodenPlacement.mp3
Has_Clip_Prefab: false