Fats rhymes with:
at-bats, atz, bats, batts, batz, blatz, brats, bratz, cat's, cats, chats, chatz, chatz', combats, dats, datz, flats, gatz, glatz, gnats, gratz, hat's, hats, hatz, kats, katz, kratz, labatt's, latz, mats, mattes, matts, matz, nats, oshatz, pat's, pats, patz, platts, platz, prats, pratt's, rat's, rats, ratts, ratz, satz, schatz, shatz, slats, spats, spatz, stats, statz, that's, vats
Fats sounds like:
faddis, faddish, fades, fads, faiths, fates, fatigue, fatigues, fatties, fatuous, fauteux, fayed's, feats, fed's, fedak, fedex, feds, feeds, feith's, feitz, fetch, fetches, fetish, fetsch, fetsko, fettes, fettig, fetus, fetuses, fetz, feuds, feutz, fiat's, fides, fifths, fifties, fifty's, fitak, fitch, fites, fits, fitts, fitz, fitzco, fitzhugh, food's, foods, foods', foodways, footage, foote's, fotis, foutch, fouts, foutz, fudge, fudgy, futch