Gnarled, knotty, twisted.
To knot or twist something.
To snarl or growl; to gnar.
A knot in wood; a large or hard knot, or a protuberance with twisted grain, on a tree.
Something resembling a knot in wood, such as in stone or limbs.
gnarled, knotted; wizened, wrinkled.
Of an object: derisorily small, tiny; of a person: puny, stunted.