Captain Earthman arrived at Coors Field over two hours early Friday for what was likely his last Opening Day, sporting a Rockies jersey, a purple-dyed Fu Manchu mustache and one of his signature eccentric hats, this one with a frog on top he likes to call “The Overseer.” Earthman — real life name Brent Doeden — made his name the past two decades as Coors Field’s most iconic beer vendor, as familiar to fans as Dinger or the waterfalls beyond the centerfield wall.