Throop rhymes with:
croup, droop, drupe, group, groupe, grupe, intergroup, regroup, roop, roope, roupe, rupe, stroop, stroope, stroup, stroupe, troop, troup, troupe
Throop sounds like:
tariff, tarp, tarpey, tarpy, terrify, tervo, tharp, tharpe, therapy, there've, thereby, thereof, thorp, thorpe, thorup, thrive, throb, throve, todoroff, toribio, torp, torpey, trabue, trap, trapp, trappe, traub, trib, tribbey, tribby, tribe, trip, tripe, tripi, tripp, trippe, trippie, trivia, troop, tropea, trophy, tropp, troubh, troup, troupe, trove, trubey, truby, true-view, trupp, tryba, turbo, turf, turvey, turvy