Hi Rose. Is there a shock of hair under the bonnet? If so, it is probably a troll of some kind.
The most collectable trolls are the 1960s Thomas Dam 'Dam Things', and there was a 12" troll from this time called 'Iggynormous'. There was a new issue from Dam in the 1980s when trolls became trendy again. I don't think that yours is a Dam original though (DAMN!) as they were marked under one foot and behind the neck, and I think that they all had just four fingers per hand, held open.
There were a lot of repros produced in Japan and Taiwan during the 80s, which were mainly sold through giftcard / giftware and toy shops and a lot were given as prizes at fairgrounds, seaside amusement arcades etc.
I'd suggest that you search him (I think that the tartan kilt makes it a Scottish 'he') under all of his clothing for any marks, although I suspect that you already have done (granny and eggs
).
I hope that this gives you a couple of avenues to explore.