allus thought it was taters & swede

McAuntie, I was just thinking you may as well call neaps and tatties "swede and double tatties" if that were the case, then checked out this site:
http://www.hwatson.force9.co.uk/cookbook/menus/burns.htm

So basically neaps are (mashed) turneaps = turnips = swede[ish turnip], and nothing more. Funny, I was almost sure there was more to them than that, and should know really, as my best mate is a Scot.