NASHVILLE, Tennessee (Reuters) - American country singer Craig Morgan calls himself a survivalist, and he is in for a frigid challenge at an upcoming sled dog expedition in the Scandinavian arctic. Morgan, a Tennessee native who is best known for hits "That's What I Love About Sunday" and "Redneck Yacht Club," said he could not pass up an invitation to test his survival skills in the annual Fjaellraeven Polar sled dog expedition. "I've jumped out of airplanes, been on scuba trips, and I was just in the Bahamas in a cage with sharks," Morgan, 48, told Reuters. ...