It has kangas! Jimenez snuck some in in a one-panel scenery shot where they totally blend into the grass and you could easily mistake them for horses if you weren't paying attention.
But the fact that I read his entire run and didn't know that until somebody pointed it out to me at S_D last year nevertheless makes me count a one-panel blink-and-you'll-miss-it easter egg like that as insufficient kangatude to be able to say "it's totally canon that the amazons have kangas." I mean, Jimenez put more effort into establishing the dinosaurs roaming around the place than that, and you know we'll never see them again.