Mottling rhymes with:
bottling, hotaling, throttling, battling, belittling, bertling, bottling, breitling, chortling, disgruntling, dismantling, entitling, hotaling, houghtaling, scuttling, settling, shuttling, throttling, totaling, totalling, unsettling, watling
Mottling sounds like:
medallions, meddling, middlemiss, middling, modeling, montelongo, monthlong, muddling