Gift art for NeoChaoticProxy of deviantArt of one of their Wyngrew characters, Pumpkin! While Pumpkin is not actually a grumblebutt, it's a cute word and she looks a little grumbly on her reference so she's probably a grumblebutt sometimes but then again, who isn't?
Wyngrew are a free to make evolving adoptable species created by Nestly (of at least deviantArt)! You can check them out here: http://wyngro.deviantart.com
Art (c) galacticpink
Character (c) NeoChaoticProxy of deviantArt
Wyngrew (c) Nestly of deviantArt