What is the name of the creature who lives in the Forbidden Pool in the Lord of the Rings universe?

The creature who lives in the Forbidden Pool in the Lord of the Rings universe is called the Watcher in the Water. The Forbidden Pool is located near the western gates of Moria and is guarded by the Watcher in the Water, a mysterious and powerful creature that is said to have been created by Morgoth, the original Dark Lord of Middle-earth.

The Watcher in the Water is described as having many tentacles, a large beak-like mouth, and a long neck. It is said to be able to move quickly and silently through the water, making it a formidable opponent for anyone who dares to enter the Forbidden Pool.

The Watcher in the Water is encountered by the Fellowship of the Ring in the Mines of Moria as they attempt to cross the bridge over the pool. The creature attacks the Fellowship, but they are able to defeat it with the help of Gandalf's magic.