All of the large piston twins of u.s. manufacture had reversible propellors to my knowledge spent time on the dc-6/dc-7 and they both had reverse thrust. Most dart-powered torboprops had a nil-thrust blade angle (grnd fine)..twin otter dhc-6 with the pt6 engind had an approach idle setting for steep approaches which allowed selsction of a propellor blade angle lower than that of flight idle..