As nouns the difference between mone and mong
is that
mone is while
mong is (dialect) a mixture, a crowd
[chambers twentieth century dictionary] or
mong can be (australian slang) a mongrel dog
or
mong can be (dated|offensive|pejorative|british|slang) a person with down's syndrome.
As a preposition mong is
(obsolete) a variant spelling of.