Landing crafts driver are called what?

Those are naval craft designed to convey troops and equipment from ship to shore. They used to be called Ducks. The designation of DUKW is not a military acronym - the name comes from the model naming terminology used by GMC; the "D" indicates a vehicle designed in 1942, the "U" meant "utility us", the "K" indicated all-wheel drive and the "W" indicated two powered rear axles.