Thought I'd add something, while we're on the topic of controlling Scrabs and Slogs... Remember that picture that was posted a while ago showing what looked very much like Stranger and Abe? There were creatures in that picture that some people believe to be Scrabs, and they appear to be tamed by some force. If they do happen to be some form of Scrab, then there are some that can be controlled, right?
http://oddworldlibrary.net/archives/...M/CAOM0006.jpg