Hmmm... well... I do not recall pumpkins being specifically mentioned as being grown on Gor, there is mention of many of the foods grown on earth as being available on Gor in some shape or form. Naturally this is not a direct quote.
Given that, I suppose an allowance could be made, in limited quantities, of said pumpkins existing.
If you did not wish to go that route, just for fun and in the spirit of the holiday, there is always striped melons and orange paint. LOL
But sure... since I highly doubt having a few pumpkins for the holiday(s) will shake the very foundations of Gor, go ahead. There may be a few bins of them in the freight wagon just waiting for a use or uses.
PS... the typist behind the Ubar loves pumpkin pie with whipped cream and cinnamon.
