Cheers for all the suggestions.
Of course in the end I ignored them all and went for these from Pathfinder pre-paints as my proxy bears:

Seemed more goblinny to me.
Also a happy ending on the EBay front as the seller swiftly acknowledged they were not 28mm scale bears as listed (claims they were a mis-listing and should have said 20mm, sure whatever) and gave me a full refund with no need to return the tiny blighters.
So now what to do with three free tiny polar bears? Any games that involve anteaters on their random animal tables?!