Nope, only urdars and his relatives.
Gargantuan beasts are the beasts in the den of evil. Hairy ones
You can find this information in the monsters.txt file. The statistics boys can probably help you further.
You have to use an MPQ viewer to look at the files in patch_d2.mpq. You'll need a diablo 2 datafile that notes where the files are located in the archive. Then, you can view the .txt files in the MPQ.
It's probably much more deep than you would like, though - as it's not a big list of: "These monsters have CB"