The Collaborative International Dictionary of English v.0.48:

Allegorizer \Al"le*go*ri`zer\, n.
   One who allegorizes, or turns things into allegory; an
   allegorist.
   [1913 Webster]

WordNet (r) 3.0 (2006):

allegorizer
    n 1: someone who communicates in allegories [syn: allegorizer,
         allegoriser]