In the 1700s trappers could get a dollar for a buckskin; hence the term buck.
People used to say “”will I, nil I?”” when they couldn’t make up their minds. Thus the expression willy-nilly.
The lollipop was named after Lolly Pop, one of the most famous racehorses of the early 1900s.
Police are sometimes called the fuzz because London police once wore fuzzy helmets.