Rather smelly and fishy.
The item id for Trout Cooked in unturned is 512. 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: 0.2
Food: 20
Blueprints: 1
Blueprint_0_Type: Supply
Blueprint_0_Supply_0_ID: 504
Blueprint_0_Supply_0_Amount: 1
Blueprint_0_Level: 1
Blueprint_0_Skill: Cook
Blueprint_0_Build: 27
ConsumeAudioClip: Sounds/EatCrunchy.mp3