So I just encountered a gracken for the first time and laughed out loud when I saw the description. This must be a subtle reference to Greg “Idra” Fields, the Starcraft player. He was errantly called “Grack” instead of Greg by a famous Korean Starcraft player. The nickname stuck (ref: http://wiki.teamliquid.net/starcraft2/IdrA#Trivia).
I looked for comments on this little trivia in the source code and in the forums, but found nothing. Anyway, I just wanted to let the creator of this little monster know that the reference was appreciated and enjoyed and let the rest of the community in on this nice little inside joke.
Release the Gracken!