Short answers, pulled from the story.
Bernard Baruch, an American financier and presidential advisor, is credited with first using "cold war" to describe post-World War II tensions between the USSR and the United States. He delivered the phrase in a speech in South Carolina on the 16th of April 1947, with the words written by journalist Herbert Bayard Swope.
The phrase first appeared in English in an anonymous editorial in The Nation Magazine in March 1938, under the title "Hitler's Cold War." It was used again that summer in newspaper coverage of the military buildup across Europe, particularly in Poland, before World War II.
George Orwell used the term in his essay "You and the Atom Bomb," published on the 19th of October 1945, in the British magazine Tribune. He also used it in The Observer on the 10th of March 1946, writing that Russia had begun to make "a 'cold war' on Britain and the British Empire."
Walter Lippmann, a newspaper reporter and columnist, gave the term wide currency by publishing a book simply titled Cold War in 1947, the same year as Baruch's speech.
The term has been applied to the Arab Cold War between Nasser's Egypt and Saudi Arabia, the Saudi Arabia-Iran rivalry, the India-Pakistan standoff (described as a cold war since 2002), the Korean Cold War between North and South Korea, Sino-Soviet relations after the Sino-Soviet split, and tensions between China and Japan.
Some writers credit the fourteenth-century Spaniard Don Juan Manuel with first using a similar term regarding the conflict between Christianity and Islam, but the word he actually used translated as "tepid," not "cold." The word "cold" only appeared in a faulty 19th-century translation of his work.