Oh indeed, there is huge ammount of creatures that drops items (equipment) they wear and even more creatures, that has visible it's creature products on it's sprites. For example Sparkion was completely divided into creature products representing parts of his bosy. Not enough room to show all of examples :D
I'll try to add some of mosters that are still interesting but weren't shown before:
Our old "friend" Orc Spearman has visible Spear in the sprite,
Ogre Brute (as well as Animated Ogre Brute) or Ogre Ruffian drops Ogre Klubba ,
Ogre Shaman and Ogre Sage wears wisible Shamanic Talisman ,
Moohtant (also Animated Moohtant, Bullwark or Moohtant Wallbreaker) drops Moohtant Cudgel ,
Mooh'Tah Warrior wears and drops Cowtana ,
Glooth Golem (also Glooth Fairy) has visible Glooth Injection Tube on his back ,
Draken Warmaster used to fight with his Zaoan Halberd , which you can loot from him,
Barbarian Brutetamer wears both Mammoth Fur Cape and Brutetamer's Staff ,
Enlightened of The Cult wears and drops Cultish Mask ,
Island Troll fights with his Marlin
Diabolic Imp (also The Imperor) holds Pitchfork
... and finally Merlkin is using his Banana Staff during fight.
Fire_Dragon mentioned about deeplings, but there's an analogy with Deathlings, which have very similar sprites. I have to mention, that high class lizards and Lizards Chosen wear huge ammount of their own creature products (included parts of weapons).
I think there is still a lot of creatures to add :)