You might know Gilbert Gottfried because of his distinctive — OK, grating — voice. He was the duck in those old AFLAC commercials. He voiced Iago, the parrot in Disney’s Aladdin. He read from the erotic novel 50 Shades of Grey in a video that became a YouTube sensation in 2012. But Gottfried is much more than a funny voice. He’s an incredibly funny man. He’s been one of America’s most original and, at times, controversial standup comedians since the 1980s. Given his rakish wit and fearless aplomb, he’s a staple of the Friars Club roasts — Google his riff on Donald Trump — and a true “comic’s comic.” On Friday and Saturday, January 8 and 9, Gottfried appears at the Vermont Comedy Club for a four-show run.