Frog Dreaming

Frog Dreaming is a 1986 Australian film starring Henry Thomas and directed by Brian TrenchardSmith who described it as a charming mystery adventure.

An American boy, Cody Thomas, whose parents have died, lives in Australia with his guardian, Gaza. Cody is very imaginative, inventive, and inquisitive. He comes across some strange events happening in Devils Knob national park associated with an Aboriginal myth about frog Dreamings and bunyips. Cody tries to investigate. The occurrences revolve around a small lake where a monster the locals call Donkegin supposedly lives. Another myth explored by the children is the story of the Kurdaitcha Man who acts as a sort of Australian version of the Boogey Man as well as a supernatural judge who deals out punishment. The children are told that he punishes any wrongs done according to the laws of the ancient Aboriginees including harm to one another, murder of animals without need for food, and destroying the environment his appearance being most notable according to myth when white men came. The Kurdaitcha Man supposedly wanders the countryside, specifically at night, and wears shoes made of Emu feathers in order to cover any tracks.With incidents at the lake increasing, Cody fashions a makeshift diving suit and goes into the lake to search, but he never comes back up. Thinking that he has drowned, the townsfolk drain the lake to recover his body. But what they really find is shocking... ........

Source: Wikipedia