I ran into two babies the first time I took a mission for them. I've yet to try them out as a team, but it should be interesting. I pulled the mission with a rancor, mountain dewback, and a level 13 droid, by the way - fairly easy to get high-level missions that way.
Because you can get missions for these, I believe they are easier to find than the normal Grauls. I was able to pull up one of these missions just being grouped with my CL31 BE Graul. Plus I usually see at least one baby per mission, and have seen upto 4. They are a bit difficult to tame at times, so you'll want to use any taming and maskscent bonuses you have. I tamed maybe 3 of these in one trip to Dantooine.