Platoon rhymes with:
attune, mattoon, antoon, attune, cartoon, festoon, huntoon, inopportune, mattoon, opportune, pontoon, toon, toone, tune
Platoon sounds like:
paladin, paladino, palatine, paldon, palladino, palladium, pallidotomy, palton, pelton, piltdown, platen, platinum, platona, platten, plowden, plutonian, plutonium, politano, pollution, poppleton, population, poulton