Related Clues:

• Tree trunk knot
• Make all twisty
• Knot on a tree
• Twist out of proportion
• Attack dog's sound
• Log feature
• Trunk protuberance
• Knotty tree protuberance
• Deform by twisting
• Twist into a knotted form
• Angry dog's sound
• Twisty tree feature
• Bump on a tree
• Contort into a knot
• Novice called about lump