The nursery rhyme with the initials "BSWTS" is "Baa, Baa, Black Sheep."

"Baa Baa Black Sheep" is a nursery rhyme that mentions a woolly mammal, the sheep. It tells the story of a sheep that gives wool, requesting sharing among three different entities.

Sure! An example of a parody on the nursery rhyme "Baa Baa Black Sheep" could be "Baa Baa Pink Sheep, have you any clothes? Yes sir, yes sir, three bags full! One for the beach, one for the snow, and one for a fancy show!"

Baa Baa black sheep

Baa, baa black sheep is based on wool taxes. You can search it on wikipedia.com.