knarls

Their crockery, much of it, was made of hard wood: from knarls they made trays, bowls, pans, plates, and sometimes spoons, knives, and forks.

The New England Magazine, Volume 1, No. 4, Bay State Monthly, Volume 4, No. 4, April, 1886 Various

It is very manifest wherever it starts, causing ugly, black, distorted knarls, at first on the smaller limbs.

Home Vegetable Gardening — a Complete and Practical Guide to the Planting and Care of All Vegetables, Fruits and Berries Worth Growing for Home Use 1930