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