The majority of the NYT answers to crossword words in the category of fake account nyt crossword are SOCK PUPPET (also spelled SOCKPUPPET, 10 letters).
Other fills: ALIAS fill (5, more common), SHAM ACCT fill (8, less common).
And in case you tell me the pattern (e.g. _ O C K P U P E T or ?_? ?_?). I’ll confirm the exact fill.