A neologian is a person who coins, creates, or crafts new words.
A neologian is a creator of neologisms (i.e. new words).
When existing words are insufficient to the task of adequately expressing an idea or require clumsy combinations of words, a neologian will craft a new or replacement word, most often by relying on verbal elements in pre-existing words or word-fragments, whether written or aural elements.
Urban Dictionary is a vast resource of neologisms (new words) produced by countless neologians.
Stephen Colbert is a contemporary and renown neologian, famous for his many neologisms, for example, "truthiness."
Neologian-PJG is the neologian responsible for the neologism "neologian" as an entry in Urban Dictionary.