Did Fox News publish an article with a headline describing a "'They/Them'" summer? No, that's not true: Fox News never published such an article. An image showing the headline appears to actually show a counterfeit version of an authentic Fox News article.
The claim appeared in an Instagram post on June 22, 2022. The post includes what looks like a Fox News article headline and subtitle that reads:
LOS ANGELES Published June 19, 2022 10:07am EDT
'They/Them' summer: a new far-left extremist plot to undermine American democracy
Experts warn that the 'deoedipianized theys' are a far greater threat than Islamic terrorists
By Danielle Wallace | Fox News
This is how the post looked on Instagram at the time of writing:
(Source: Instagram screenshot taken on Fri Jun 24 14:14:13 2022 UTC)
A search on Fox News' website of the headline didn't generate any results. The article also wasn't shown on the author page of Danielle Wallace, the Fox News Digital reporter and writer who supposedly wrote the article.
However, Lead Stories did find an article by Wallace published on the same date and time as the fake article. The real article was titled "LAPD form skirmish line after officers pummeled with fireworks, bottles during 'street takeover'" (archived here):
As seen in the screenshot included above, the fake article and the real article have the same byline, publish date and time stamp, indicating that someone altered a screenshot of the original article or changed the headline and subtitle in their web browser to make it appear as if the fake article was a legitimate Fox News article. Lead Stories has previously shown how a webpage can be altered in a web browser to replace text on that webpage.