Castagna rhymes with:
montagna, adragna, alagna, lamagna, montagna, adragna, alagna, benigna, bentivegna, brogna, cigna, cygne, hegna, lamagna, magna, megna, mignogna, montagna, signa, spagna, vigna
Castagna sounds like:
cadogan, castagno, catchacan, catechism, cetacean, chautauquan, citizen, costigan, cotugno, cutchin, cutugno, cytogen