ndraneil Das of the Universiti Malaysia Sarawak said the brown frog is just 4-5 centimetres (1.6-2.0 inches) long and makes a distinctive high-pitched chirp.
His team discovered the frog during an expedition to the rainforests of Mount Singai in the Malaysian state of Sarawak on Borneo island in September 2010. They later found another of the same species in nearby Kubah National Park.
Ascertaining whether a species is new is a lengthy scientific process and his discovery remains to be peer-reviewed, he said.
"We heard a call we hadn't heard before. It called from under the leaf litter. That's probably why no one saw it before," Das told AFP.
"It's the call that is very distinctive. It was high-pitched, loud and repeated."
Das said his team had also found several other species of frog that could be previously unknown and was currently investigating them.
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