Is there such a word as knarled?

Yes, "gnarled" is a word. It's spelled "gnarled", not "knarled".

Gnarled means:

* (of a tree branch, root, or similar object) twisted or knotted with age.

* (of a person's hands, face, etc.) wrinkled and twisted, especially because of age.

Let me know if you have any other word questions! 😊