roly-poly (adj.)youdaoicibaDictYouDict[roly-poly 词源字典]
"short and stout," 1820, probably a varied reduplication of roll (v.). As a noun, it was used as the name of various ball games from 1713, and it was used as early as 1610s in the sense of "rascal." As an appellation of a short, stout person, from 1836.[roly-poly etymology, roly-poly origin, 英语词源]