Backronym

A backronym is an acronym that's specially constructed to fit an existing word.

Source: tatoeba (3579025)

[T]he phenomenon has been dubbed STEVE, a backronym that matches the name originally given by aurora watchers. (STEVE is short for "Strong Thermal Emission Velocity Enhancement.")

Source: wiktionary

These reverse-engineered acronyms, or “backronyms,” are inescapable on Capitol Hill. Two of the biggest laws of the past few years were the CARES Act, for pandemic relief, and the CHIPS for America Act, for semiconductor manufacturing. […] Yet congressional backronyms have been on the rise for years: I wrote a computer program to check legislation titles for acronyms that spell out complete words, and found that roughly 10 percent of bills and resolutions introduced over the past two years have had backronym names—up from about one in 20 a decade ago and less than 1 percent in the late 1990s.

Source: wiktionary

Musk's recent posts have included several references to alt-right themes and fascism, experts told Insider. In a recent post, he shared a meme including Pepe the frog and a caption featuring the word "fren" — an apparent misspelling of the word "friend" — a backronym for "far right ethno nationalist."

Source: wiktionary