It's dropped. I'm not sure which creature drops it, but you can find it in Krokotopia. It's a snack. I didn't think my pig would like it much so I sold it the Bazaar for 150 gold [ I think that's the price].
nettle root and other great pet snacks- such as medium fish, stinky cheese, and golden squash, to randomly name a few- can all be bought at the bazaar and, so i hear from a fellow named Peak, are great ingredients to make a sandwich with. -eli and crew