Travis Kelce was in the mood for his signature frozen custard, so he hit a drive-thru ... and he gave one lucky worker a fat tip for fulfilling his cravings. We've got the sweet scoop ... Travis rolled up to an Andy's Frozen Custard in Kansas City, MO Thursday night and ordered the Travis Kelce 87 Concrete frozen custard ... and he stunned the girl who was working the drive-thru when he pulled up to the window. The employee, who owns Hidden Files Studio clothing brand, tells TMZ ... the Kansas