Gruntle

I found references to this on sites such as FunTrivia.com and Answers.com – neither of which I would rely on to verify any fact or assertion.

Lots of sources describe "gruntling" as a noise that pigs make - kind of a cross between a grunt and a snort - and on qi.com, the forum of the BBC television programme of that name, someone called suze claims that "from there a pig's snout came to be called its gruntle". But she (I'm guessing that suze is a she) doesn't give any justification for this claim.

The truth would seem to be that this is a Scots dialect word. The Dictionary of the Scots Language cites examples dating back to 1818, and quotes from James Telfer's Border Ballads (1824): "And the stinkan brokke, wi' his lange howe loone, Shote up his gruntle to see."

It also gives grunkle as an alternative form of the word.

One thing, however, seems clear: this is not science!