Neologist

ne-ol-o-gist (niˈɑlədʒəst)

noun

1. a person who coins new words or phrases.

Some clever neologist has been running around the internet trying to make librocubicularist a new word, with varying degrees of success. I did find it on Wordnik, a site that often seems full of neologisms.  

Synonyms: bombast, child, circumlocutionist, poet, teenager, undergrad.