Interesting example to pick! It apparently has roots in the black plague, and probably existed in close to it's current form since the late 18th century.

https://wikipedia.org/wiki/Ring_a_Ring_o%27_Roses

Actually this rhyme probably had nothing to do with the Plague at all, although people go on about this all the time. This 'connection' was only picked up mid-20th century and not mentioned before.

https://blogs.loc.gov/folklife/2014/07/ring-around-the-rosie...