Forgotten rhymes with:
gotten, misbegotten, botten, cotten, cotton, gotten, groton, guncotton, misbegotten, otten, rotten, scotten, scotton, totten, totton, trotten, wotton
Forgotten sounds like:
fabrication, feuerstein, fierstein, firestine, firestone, forstmann, fraction, freestone, freston, friction, frighten, fruchtman