This Santa is on the very, very naughty list. A married Santa Claus impersonator who sat “thousands and thousands of children” on his lap over the years has been nabbed in an undercover child sex sting Thomas Allen Hicks, 68, a white-bearded professional Santa and preacher of 40 years, allegedly responded to an online ad posted by an undercover detective pretending to be a parent offering sex with their 13-year-old daughter, according to Polk County Sheriff Grady Judd. Thomas Allen Hicks is a Santa Claus impersonator who has been nabbed in an undercover child sex sting Polk County Sheriff's Office The accused predator was busted after agreeing to pay $200 and explicitly describing the sex acts he wanted to perform on the child — and grossly promising to be “gentle,”  the sheriff’s office said. “I talked to the real Santa Claus today, and he’s pissed,” Judd joked to reporters on Wednesday.…