Sentence:  Next, he opened his stall and spread his meat upon the bench, then, taking his cleaver and steel and clattering them together, he <WSD>trolled</WSD> aloud in merry tones:... 
Meaning of the word marked with <WSD> tags:  To sing the parts of in succession, as of a round, a catch, and the like; also, to sing loudly, freely or in a carefree way. (from the 16th c.)