A lull in World War II in 1939-40 was dubbed what, punning on the word "blitzkrieg"?

Which word means both a loud resonant sound and a time of prosperity? Which Louisiana university, founded in 1901, became a famous HBCU football power? King Albert II reigned over which Low Country from 1993 to 2013? A lowlight of which Brat Packer's career was singing and dancing with Snow White at the 1989 Academy Awards? What is a lump or blob of something like whipped cream called? What is the Spanish word "jamon" in English? What is a lycanthrope? Complete the name of this Mac operating system: "Snow ___".