I'm with everyone who says those are sharks teeth.
The other thing I'd question is the "kangaroo dung as glue." Not that I'm a specialist, but kangaroos are herbivores, and their poop is more like that of a cow. When dry, it's fibrous enough to use as tinder for fire starting and even as a paper additive.
My guess is some sort of dung. Many aboriginal knife handles are made from molded spinifex gum, and that's what I suspect that's what was used here to fix the teeth.
Best,
F
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