Arnold

I named Tarzan's little friend, the crocodile, Arnold after my step-daughter's 80 pound American Bull Dog Arnold.  Arnold the dog was in turn named after Arnold Schwarzenegger the actor. 
Like Arnold the dog, Arnold the Croc loves to play tug-a-war and wrestle with Tarzan.  Most of all Arnold just loves attention from Tarzan and gets a bit cranky when Tarzan tries to ignore him.