Carly Rae Jepsen describes her character “Frenchy” in one word. FOX enrolls at Rydell High with GREASE: LIVE, a LIVE one-night musical production of the massively popular crossover musical “Grease.” GREASE: LIVE stars Julianne Hough (“Safe Haven,” “Rock of Ages”) as the angelic “Sandy” – Rydell High’s most talked-about newcomer – and Aaron Tveit (“Graceland,” “Les…