OK I'll give it a go. This can be nothing more than the wildest of guesses based on a vague idea of the shape and something about the way the topmost branches are held. Maybe Wych Elm - Ulmus glabra. But they could be almost any of the deciduous trees found in the Carpathians ie oak, linden, hornbeam, etc. There are several different species mixed in there, I believe. I'm curious as to why you want to know if they'll grow in Australia. The picture comes from Wiki and shows a house in Transylvania i.e. the Carpathian Mountains. Check the climate there and compare with Eastern States of Oz. I suspect there's not much similarity.