What follows is an email from Dr. W. H. New responding to my question regarding trickster figures in Australia:
"Check out BAMAPANA, a northern group's trickster (there are 80 or so different peoples covered by the term 'aborigine' so generalizations are problematic). Bamapana is obscene, he's causes discord (and laughter, another kind of discord?), he flouts conventions, specifically the taboo against incest... etc.
Now the term 'dream world' like all the others (dreamtime, dreaming, dream-place) are also problematic. Contemporary aboriginal groups sometimes use the word 'law' to refere to the dreaming. "The dreaming' conveys the notion that it's a process not an early position in linear time; but on the other hand there is a sense in which the dreaming occurred in time past but can also be participated in in the present, so that time is sort of cyclic, each generation having access to it. There was something inchoate prior to the dreaming; spirit beings were in that, and emerged during the dreaming--taking forms that relate to the forms of the fauna and landscape of different parts of Australia, eg. kangaroo-men, crocodile-men, etc.: in turn, or at the same time somehow, these spirit figures became the landscape: kangaroo-man sitting becomes a ridge, eg---and all together these figures and events and places constitute the set of rituals and conventions that are reenacted as custom--or 'law'. So I guess (and here I am guessing) any trickster figure here would be at once an entertainment and a horror or source of uncertainty, in that he embodied that which the convention said was taboo. But Bamapana is the only trickster name I know of, so the trickster figure might be less widespread that I'm guessing.
Or, of course, are you talking about contemporary Oz, in which case hoaxes are a kind of national sport, and tall tales, etc. (About which I have written an amazingly readable article, in a book on the short story just published in 2004, ed. Per Winther (and I think Jacob Lothe), and pub in where Kentucky or South Carolina or something.)"