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Fresh tags are a "tag" that used to be quite common next to results in Google. They showed listings that were recently crawled. Would say something like "Fresh - Sept 12" etc.
I have to say, I haven't seen any recently, but it's not uncommon for Google to be running various tests on different datacenters.
They became known as "fresh tags" because that's what they said..."Fresh" then the date it was crawled right next to the listing in the SERPs.
This began a couple of years ago, when Google had two different types of bots running around, the "deep bot" and the "fresh bot". The deep bot did the deep or full indexing for the monthly updates and the fresh bot did the indexing inbetween the full updates.
This stopped quite a while back now when Google went to a system of continual updates (the end of the old style "Google Dances" where the crawl info from the previous crawl was rolled out) which is why they aren't generally seen anymore.
By the way Jake, wasn't trying to be rude in the first post. You just can't get much more specific than "fresh tags" as that is exactly what they were always called ( I haven't seen one now in well over a year).