Smelly and Hard.
The item id for Crab Leg in unturned is 6635. 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: Consumeable
Size_X: 2
Size_Y: 1
Size_Z: 0.33
Food: 70
Blueprints: 1
Blueprint_0_Type: Supply
Blueprint_0_Supply_0_ID: 6634
Blueprint_0_Supply_0_Amount: 1
Blueprint_0_Level: 1
Blueprint_0_Skill: Cook
Blueprint_0_Build: 6607
Blueprint_0_Map: Easter