People at the Manhattan Project named it Fat Man and the other one was called Little Boy because of their size and shape.
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Which bomb?? If you mean the code name given to the bomb dropped on Hiroshima, it was called "little boy".
"fat man" was the name of the atomic bomb dropped on Nagaski. "little boy" was dropped in Hiroshima.
Little Boy was the code name for the bomb that hit Hiroshima at the end of WW2.
The name of the atomic bomb that was dropped on Hiroshima was "Little Boy".
The US dropped the first atomic weapon on Hiroshima on August 6, 1945, during World War II. The B-29 that dropped it had the name "Enola Gay" and was piloted by Colonel Paul Tibbets, US Army Air Force.