What is Panju Mittai called in English?

It is called as Cotton sweet candy or Candy floss.

Candy floss is the same thing as cotton candy. Both names are adopted from the original name, fairy floss. Two Nashville, Tennessee candy makers dubbed this light as air and super sweet confection fairy floss in 1897. They created an electric machine that would produce the spun sugar, and sold this confection at the St. Louis World’s Fair in 1904, where it was extremely popular.