Honestly you go back far enough the western most parts of the 13 colonies were considered the frontier. But yeah Splash Mountain wasn't the modern day meaning of the frontier.Disney itself described the ride as “a Southern bayou”, and the whole thing seemed very Southern to me. Not that I minded—the same applies to the Country Bear Jamboree, which I love (obviously!). “Frontierland” has always been a bit of a misnomer given that Southern elements have been there from the start. Guests seem not have been bothered by this in the past, and I doubt they’ll be bothered by it once Tiana’s Bayou Adventure opens.