<P> As a commercial actor, he voices a talking ball of mucus in commercials for Mucinex and stars as Greg the Genie in a promotional campaign for Slim Jim meat snacks . </P> <P> In Miller's film debut, Cloverfield, he appeared onscreen for only a few minutes, but his voice was heard in almost every scene as the character who videotaped most of the events depicted . In 2009, he played Cessna Jim in The Goods: Live Hard, Sell Hard and the dim - witted grindcore musician Rory in Mike Judge's comedy Extract . In 2010, he co-starred in She's Out of My League as Stainer, played Brian the Concierge in Get Him to the Greek and appeared in a supporting role in the film Unstoppable . </P> <P> He voiced the character' Tuffnut' in the Oscar - nominated animated films How to Train Your Dragon and How to Train Your Dragon 2 . He also played Dan in Gulliver's Travels, released in December 2010 . He played the supporting character of Ranger Jones in the live - action / animated Yogi Bear 2010 film . </P> <P> Unlike his character on the cartoon show, he is "dumb - but - not - in - a-funny - way", according to the Buffalo News . He was cast in the part after two auditions; as a joke, he sent Warner Bros. an improvised video audition with an actual bear, though he had already been offered the part before they received it . </P>

Who does tj miller voice in how to train your dragon