No... Sukkot is the full moon of the seventh month, as determined by the ripening of the winter barley in the spring. "Leap" could push it forward 29 days, the sighted moon could push it forward one more day (two, some may argue), But not all the way in December, not to mention the end of December... What MAY be considered to correspond to christmas from time to time is Hanukkah (25th of the ninth month).
Thanks for that, roamer!