Well
Arena
http://www.imperial-library.info/sites/default/files/gallery_files/arena_shot03.gif
Daggerfall
http://www.uesp.net/image.shtml?dagger/images/dragon.gif
http://images.uesp.net//5/54/DaggerfallDragonling.gif
For Arena, retcon (also I don't even remember that)
For Daggerfall that is Peryite in the first pic, not a real dragon
For the second pic, dragonlings aren't dragons that's just there name. I could be mistaking, but that's what I remember.
Redguard's dragon was two legged, Morrowind statues were two legged, Akatosh is two legged, so dragons in TES are two legged.