Frumpy rhymes with:
grumpy, bumpy, clumpy, dumpy, grumpy, jumpy, lumpy, bumpy, campi, campy, ciampi, clumpy, dumpy, empey, empie, grumpy, jumpy, lampi, lumpy, pompey, rampey, rampy, sampey, skimpy, stimpy, swampy, tempe, wimpee, wimpy
Frumpy sounds like:
farmboy, formbey, formby, fornoff, frump