A green tree frog has pulled off a great snake escape in far north Queensland, with a zoologist saying the amphibian was regurgitated alive.

Zoologist and part-time snake catcher Lauren Dibben, from Weipa on western Cape York Peninsula, was attempting to remove a common tree snake from a home when she noticed a bulge in its belly.

"I noticed a lump started to come back up and there were a few people standing around watching so I said 'it's about to regurgitate something, perhaps it ate a mouse'," she said.

"The next second it actually regurgitated a green tree frog, which came out back legs first and it plopped out on the concrete.

"I ended up taking the frog under the tap because it was still alive and rinsed it off and he was breathing and pretty normal."

Ms Dibben, who is Weipa's only licensed snake catcher, said the frog would have only recently been eaten.

"[The snake] has let it go because of me," she said.

"I think I saved the frog's life, but I'm pretty sure he's going to be mentally scarred for life."