Walt Dohrn. Actor: Trolls. Walter Dohrn is an American animator, writer and voice actor from Orange County who is mostly known for voicing Rumpelstiltskin from Shrek Forever After. He also wrote several episodes of SpongeBob SquarePants including Sailor Mouth and voiced in other DreamWorks Animation films such as Trolls, Shrek the Third and Trolls World Tour.