Amphibios 9 is a habitable planet in possession of a substantial amount of water. The surface consists mainly of swamps and rain forests. Acting as the home planet of the Amphibiosans, Amphibios 9 also has one astеroid which acts like a moon.
In 3003, Kif Kroker touched Leela's hand while she was rescuing him from being sucked into space through a hole in the hull of the Nimbus. As he was in his "receptive state", due to his smizmar Amy, he became pregnant with offspring that were the genetic combination of DNA from himself and Leela. The Planet Express ship took him to Amphibios 9, where he went to his clan's sacred birthing grounds, where the Grand Midwife held a ceremony in which he gave birth to several offspring. As Kif's smizmar, Amy adopted the babies, although as Amphibiosans, they don't need parents to actively raise them as they are self-sufficient. They'll remain in the swamp at Clan Kroker's sacred birthing grounds until 3023, when they'll sprout legs and crawl back onto land.
In 3017, the Hypnotoad hypnotized Professor Farnsworth, making him order the Planet Express crew to take him to Amphibios 9. Once there, the Hypnotoad commenced his buzzing noise, making hypnowaves that revealed the female hypnotoad from a perpendicular universe. The universe was pulled into the hypnowaves, but Lord Nibbler saved Fry from being sucked in as well. Fry worked with Nibbler, then later Professor Farnsworth, to restore New New York.