Platoons rhymes with:
cartoons, pontoons, tunes, afternoon's, afternoons, baboon's, baboons, balloons, boons, cartoons, cocoons, coones, coons, croons, dunes, funes, goons, harpoons, impugns, june's, junes, koon's, koons, kuhns, kunes, lagoons, lampoon's, loons, monsoons, moon's, moons, noons, nunes, pontoons, prunes, raccoons, rangoon's, runes, saloons, spoons, tunes, tycoon's, tycoons, typhoons, verboons
Platoons sounds like:
paulding, pelting, piloting, plaiting, plateauing, plating, platinum's, platonic, plaything, playthings, pleading, pleadings, plodding, plotnick, plotting, plutonic, politeness, polluting, populating, populations