No, that's defrosting CO2 in the polecaps, not the same as frost polygons which requires a mixture of rock and ice (of either variety)

e.g. Faint polygons visible in the full-res image

or a google image search for polygons on Mars

or even a google search for text articles discussing patterned ground and frost polygons on Mars

Some important things to be aware of though. On Earth, polygons usually form by frost heave involving freeze-thaw action but they can also result over longer periods by simple expansion and contraction of permanent ice through annual and decadal temperature cycles.

On Mars, with its ultra-cryogenic climate and almost ststic surface, some polygons may have evolved over A BILLION years of occasional temperature cycles, but need never have thawed in all that time.

Or they might have thawed, but that's the challenge, to PROVE what happened on Mars hundreds of millions of years ago, when we've never set foot on the planet and are limited to interpreting orbital pictures and limited data from a few landing sites.