Large Creature Overrun of a Meduim and Small Creature

A halfling and a human are blocking a group of winter wolves (large) on a 10′ wide ledge. Can the wolves just squeeze through the halfling’s space that is two sizes smaller; at 1/2 speed or 1/4 speed? Do the wolves need/get to overrun both at advantage since they only take up two squares a winter wolves take up 4? Playing G2 from Tales from the Yawning Portal.