Eco-zones are large areas that span across continents and countries, not actual individual different habitat. A few examples, the Neotropical zone starts in southern Mexico and goes down into South America. It also includes the islands of the Caribbean. The Ethiopian zone is Sub-Sahara Africa, Madagascar, and the islands of the western Indian Ocean.
You really don't want to house animals together simply because they come from the same eco-zone. Eco-zones are made of many different habitats. The zone in which we live in, the Neoarctic zone is includes deserts, grasslands, temerate rainforest, woodlands, tundra, swamps, and so on.
You want to separate them by species. I counted six species, so you will need six enclosures.
The brown treefrog you described sounds a lot like Polypedates leucomystax. http://calphotos.berkeley.edu/cgi/im...el-lifeform=ne