tempafrost 

Permafrost that has temporarily melted.

The permafrost is turning into tempafrost because of climate change melting the ice.

tempafrost by Climate Change Association January 31, 2023

Tempofrost 

The melting of permafrost ; when permafrost is no longer permanent (temporary frost)

The tempofrost in parts of Alaska is causing a housing crisis.

Tempofrost by BiggKirk May 14, 2023