Trooping rhymes with:
drooping, grouping, regrouping, drooping, grouping, looping, recouping, regrouping, scooping, shuping, snooping, stooping, swooping, whooping
Trooping sounds like:
terpening, terrifying, thriving, throbbing, trapping, trappings, travnik, tribune's, tripping, trupin's, turbans, turbines