From a system called Space Odyssey from Toto Toys, they are components for making marble tracks (you now, put a marble in the top opening and see it rolling down the track you built). Got a box full of bits at the local flea market, 1 euro.
And stumbled on this in a discount shop, not sure if you have seen this before (did a search on the forum, couldn't find anything about it). It comes not only as Tarzan but from a few other Disney movies as well, but the rest wasn't really my taste or suited for this...I think anyway....might make a quick shot of them later this week if I hit that shop again.
5 euro's for a pack containing:
The cage could be usefull too, but the rest can go into the bits bin.
And it compares to 28mm figs like this:
Of course, they are equally useful for my 20mm stuff
Johan