William Robert "Rob" Pinkston IV (born January 30, 1988) is an American actor who appeared during the fourth season of MTV's hidden camera practical joke television series, Punk'd. He also played "Coconut Head" on Nickelodeon's Ned's Declassified School Survival Guide. He attended William S. Hart High School, in Santa Clarita, California a city located north of Los Angeles. He was in Extreme Movie with Ryan Pinkston and Frankie Muniz.

Rob currently serves as a StarPower Ambassador for the Starlight Children's Foundation, encouraging other young people to commit their time, energy and resources to help other kids and working with Starlight to brighten the lives of seriously ill children.