The last of the four items has definitely been around for years already, but the other three may indeed be spawned of the series. One thing I wonder about is how much LBT stuff is out there that we don't know about. When I was in Minnesota I bought a couple of LBT jigsaw puzzles at a mall. I never ever saw any of those at ebay.
They also sold "LBT crayons" there which I didn't buy as there was nothing LBT related about those poor quality crayons except for the LBT collection seal on the wrapping of the crayons.
There are some LBT items whose existence is likely but not proven. I'm quite sure there must be more of those LBT brooches issued in 1988 which I used to create my first LBT tinfigures. I have such brooches of Littlefoot and Ducky, but I consider it very likely that there must be some more. I guess those brooches about whose very existence I am not certain are the LBT items I'm really after.