From Longman Dictionary of Contemporary Englishscallywagscal‧ly‧wag /ˈskæliwæɡ/ especially British English (also scalawag American English) noun [countable] old-fashioned BAD PERSONa child who causes trouble but not in a serious way – used when you are not angry with them SYN rascal
Examples from the Corpus
scallywag• And it seemed no time at all since he was a young scallywag and always in trouble. 