I can help out if you tell me what format you want the data in...
Also, what kind of source are you looking for? Data that's already out there or lore data?
Those dinos have been out for ages now, considering how many people use your UI, no one helped?
there are some dino on the DB, but some have changed when they become tamable, others were added with the new tamables and noone really cares about gathering data as long as things are working
Other people just like to mind their own business and if there is a problem they just wait to get fixed without reporting it (like if I have the crystal ball and know things that have not been reported)
anyway, you can open the file CreaturesDB.lua in the UI folder and search for the name of a creature, if it's not there, the data is missing. If they don't have a line like: "tamable = 104.7," the taming required is missing so it won't appear in the list.
They should be just few new creatures missing, if you find them let me know