Forget the backyard spa, Tasmanians are being urged to build water features on a much smaller scale in order to encourage local amphibians.

There are about 200 varieties of frog in Australia, three of them are found only in the island state.

Loading...

The Tasmanian tree frog, Tasmanian froglet and the moss frog come out in full force after summer rains.

Also to be found in Tasmania are the spotted marsh frog and the pobblebonk frog.

Felicity Harvey from the Foundation for National Parks and Wildlife wants to see more residents sharing their backyards with native frogs.

She said frogs are the best indicator of a healthy in ecosystem.

"They're very susceptible to changes in the environment," she said.

"They have porous skin so they absorb a lot of chemicals.

"In Tasmania they're surviving and they're doing pretty well, which is a good sign the ecosystem is doing well too."

Ponds for pobblebonks

Residents who hear an unusual croak may be hearing the eastern banjo frog which is also known as the pobblebonk. ( Supplied: Lorraine Phelan )

She said the Tasmanian tree frog, which is mostly found on the west coast, is one of the more common species.

"There are more unusual frogs found in the alpine areas but in terms of your own backyard the brown tree frog is another common one," she said.

"The eastern banjo frog is also called the pobblebonk which comes from its call."

One West Hobart resident reported froglets appearing in a backyard pond in late December.

Ms Harvey urged other Tasmanians to take to their backyards with shovels.

"I can say first hand it is surprisingly easy," she said.

"I made one for my mother's garden a couple of weeks ago and it was a lot easier than I thought it would be.

"All frogs need moist environments because their skin is so porous.

"My mum actually reported frogs breeding in her pond four days after the pond was installed."

This banjo froglet made an appearance in a backyard pond in West Hobart just before Christmas. ( Supplied: Greg Lehman )