Cropping rhymes with:
dropping, propping, chopping, copping, dropping, flopping, hopping, lopping, mopping, popping, propping, shopping, sopping, stopping, swapping, topping, wapping, whopping
Cropping sounds like:
caravans, carbonize, carbons, carpencic, carpencic's, carping, carving, carvings, cervenka, cherrapunji, chervenak, chirping, chriboniko, chriboniko's, corpening, craven's, cravens, craving, cravings, creepiness, creeping, cribbing, curbing, curving