I'm researching Knickerbocker's Lord of the Rings figures at the moment with a future project in mind.
Looking at their Gollum figure I was struck how much it looked like a toy figure I had as a kid, the restless skeleton, a sort of King Tut from Ellisdons of Liverpool.
Here they are side by side, Gollum on the right. Knickerbocker's line was based on Ralph Bakshi's animated film version of Lord of the Rings - have you seen it?