This is a request to enable the code mn-mong for Lexemes. There are several Mongolian lexemes with representations tagged with mn-x-Q1055705 which can be replaced with this code.
Examples:
https://www.wikidata.org/wiki/Lexeme:L315707
https://www.wikidata.org/wiki/Lexeme:L689687
https://www.wikidata.org/wiki/Lexeme:L687991
See also T137810: [Task] Add monolingual language code mn-Mong, which added mvf instead