Sam Lavagnino (born June 29, 2006) is an American voice actor and YouTuber whose roles include Catbug in Bravest Warriors and Young Grizz in We Bare Bears. He also voices the dog "Rolly" in the Disney Junior show Puppy Dog Pals and "Mr. Muffin" in the YouTube series asdfmovie. Description above from the Wikipedia article Sam Lavagnino, licensed under CC-BY-SA, full list of contributors on Wikipedia.