These draconians are neat. I infer that they're from a past edition of D&D, but sadly they are not familiar to me.

I'd give the sleep a flat cap of 75 HP, but that's because I really like the game's focus on rolling as little as possible when it comes to the actions of monsters. Keeps things going.

May I suggest tweaking these a bit to emphasize their elemental natures? For example, the bozak here obviously has a connection to fire. In addition to its death throe, why not have it throw off some jets of flame from its wounds? I suppose what I'm saying is that the barely-contained elemental power in their blood should be obvious, rather than only coming into play when the creature dies. It might give players a clue that they might want to finish these things off from a distance, as well as just give them a solid, cohesive theme as a creature type.

The baaz could catch weapons with every blow, surprising the fighter into using a backup weapon and the poisonous acid of the kapak could daze or hamper anyone who gets a whiff of the caustic goo in their veins.

I might use creatures like these in my own game. Thanks for sharing them.