Santa Claus melon & Christmas melon (1923)

[Bapopik at AOL.COM]

   They're the same melon.  Neither is in OED.

   19 December 1911, NEW YORK TIMES, pg. 20:
   _Stockholders Expected Such a Christmas Melon Last Year, Too, and Were Disappointed_.
("Melon" here is financial slang.  I've got to do that dictionary, too--ed.)

   23 May 1923, NEW YORK TIMES, pg. 5 ad for Knickerbocker Ice Company:
   At Christmas comes the luscious Santa Claus melon.

   19 December 1923, NEW YORK TIMES, pg. 4 ad for Knickerbocker Ice Company:
   The Santa Claus Melon--These long, luscious Christmas melons have come all the way from South Africa to grace the Holiday table.