Here's what rhymes with splto.
o au oh owe aux bo doe dough po toe tow beau eau jo ow beaux cho dau eux oe doh no so know go though low show co blow pro row tho fo foe ho lo plateau mo ro wo woe yo bio ceux faut goe hoe ko propos sew soe vo mow noe roe sho topos tuo yeux zo bro plateaux rho stow trow turbot whoa borzoi although below ago flow grow radio slow snow throw glow quo studio audio bestow fro chateau crow folio patio stereo thro forego forgo polio tableau uno apropos dicho floe rodeo spatio tableaux chateaux dunno throe trousseau chapeau kapok oleo sloe tarot foreknow bandeau gateau kayo chapeaux gateaux pekoe trousseaux schmo resew schmoe ratio embryo hello portico nouveau vertigo aglow aliquot mistletoe outgrow siglo undertow deathblow regrow matzoh fatso romeo tallyho overthrow undergo buffalo overflow indigo calico dynamo politico cameo domino escrow medico presidio afterglow adagio piccolo overgrow pompano microdot portfolio bungalow oregano pistachio mustachio moustachio braggadocio archipelago impresario pianissimo generalissimo