The fat dragon, Themberchaud, is actually a canon obese dragon. He's in the Out of the Abyss module and some others.
Huh, TIL.
Still, without knowing that, it looked exactly like the kind of collective meme the table would come up with and beg the DM to add.
Absolutely, the whole movie felt like that which was a big part of it's charm. Watching the first scene I could imagine the players asking the arrakoan chancellor's name, which the DM hadn't prepped, so he just made up Jarnathan on the spot..