First Mention: WB2014 Lord Crush - Part 1
Eyesaurs are Mounts used by the Squashcourt. Prince Axe Bodyspray rode one that was described as "particularly hideous looking".
Real World References
This is a pun on the expression eyesore.
Also -Saur comes from the Greek word "sauros" (lizard) and is used as a suffix of several reptile species' names: Oxford Dictionaries