All it's missing is some little tappy footstep sounds and you got yourself a runnin' Croc. :P
Very nice motion with the arms and legs, has that anatomical consistency but still has that delightful cartoon bounce to it. A blink every third loop'd be a nice touch for some diversity, but I understand if you wanted to keep the file size low that you'd want to avoid it.
Keep it up! Or as Croc would say...
YAZOO! :D