By Brandy McDonnellDarci Lynne Farmer, the Oklahoma City singer and ventriloquist who won "America's Got Talent" Season 12, showed off her versatility on her first televised holiday special, "Darci Lynne: My Hometown Christmas," which aired Tuesday on NBC. The 14-year-old entertainer sang favorite yuletide songs with and without her puppets, and she cracked jokes with spry comedic timing.