I have read this post a few times, trying to understand what mob your actually looking for, Im still not 100% sure, but Ill toss this in:
Evo made their frenzied ostards look like raptors on steroids, graphically. They sound the same for the aggressive sound, but dont make the frenzied passive, cooing sound (my words). If you are looking for these, just roam around T2A(the zone where Delucia & Papua are in) & tame/hunt there. Players use them for pack hunting because of their pack instinct bonus & because you can control 5-10(once youve opened up your control slots to max).
Your use of "small Gdragon" is what throws me. They dont look like a Gdragon to me. I didnt know anything in the Jurasic Park was tamable, but that was released during my absence & I have only done a cursory explore of the area.
I dont know if this was helpful, but what the hell, I can try. *giggles*
*hugs*
Sage