This thread didn't get much traction the first time around, but I just picked up another "uncatalogued" bobber. The center guy in the photo; what I would have called a "white base head on a green base body." I just noticed something, though...
My traditional "catalogued" white base dolls both have blue in the eyes, reddish hair and a black button on their caps. My two "uncatalogued" dolls have solid black pupils, dark brown hair and orange buttons on their caps.
Maybe these "WEREN'T" a marriage of mismatched parts but were an actual short production run made between the traditional white and green base nodders