More undead mounds (more mounds of mayhem)

I just got a idea that just randomly came to me. Sure the stray, withered, bogged, and even husk horse variants sound cool. I thought of other animals that could be ridden and have an undead side to them. Animal 1: The stray poler bear. The stray poler bear is like the normal poler bear when it doesn't have a stray skeleton on it, but when a stray rides it, the poler bear will charge at you doing a good amount of damage and is ruthless with the stray riding it. Animal 2: The bogged crocodile and alligator. These two animals when a bogged is riding on them will chase you and attack you like a normal undead mob, but when these animals both get in the water. They both get faster making them both dangerous. And they are not friendly even with no skeleton on them, or zombie. (All of this applies to skeletons and zombies with ether of them riding these animals) Animal 3: The dry Scorpion. This mob (along with normal Scorpions) will chase you non stop and dont need a skeleton or zombie riding them to chase you. I know you have wanted a Scorpion in Minecraft, but i thought of both that and undead Scorpions. Along with husks and parched skeletons riding on it, with them riding on them. The Scorpions and dry Scorpions will fling the skeletons or zombies twords the player to help catch the player. Those were all the best other animals to let have an undead side to them with abilities. And the Scorpions and undead Scorpions both have a poisonous sting to them too.