Do you mean this item? https://bdocodex.com/us/item/3053/ You can get it by hunting Giant Boars with a matchlock (make sure you only hunt the Mobs that say <Wild> above their heads). They can be found in the mountain range between Florin and Olvia, and between Balenos and Mediah.

There is no green version just "Stuffed Boar Head". While it is shown in bdolytics (https://bdolytics.com/en/NA/db/item/3005) it does not actually exist in game under that name. Instead, it only exists as "Stuffed Giant Boar Head" with the same item effect.