One of the words on the Scrabble board is GODSWRATH. Scrabble rules prohibit the use of two or more words (or phrases) on the same line.
Even if "nomnomnom" was acceptable under Scrabble rules (which it wouldn't be), it's a 9 letter word which, unless it was connected with two words on the board (and it wasn't), would be impossible to make. Furthermore, Mindy clearly had five tiles left on her rack when she was placing it on the board.