Then he invented a patent boot heel to crack nuts with, but he mashed his thumb with it and gave it up.
"The Prairie Farmer, Vol. 56, No. 2, January 12, 1884" by Various
But unfortunately several of the farm nut tree plantings I have seen show a woeful lack of "green thumb" intelligence.
"Northern Nut Growers Association Report of the Proceedings at the Thirty-Eighth Annual Meeting" by Northern Nut Growers Association
He put his thumb and finger into the pits and cracked a hard nut with the stone.
"The Tree-Dwellers" by Katharine Elizabeth Dopp
One touch of my thumb, up you go in a cloud of smoke and come down in a shower of nuts and bolts.
"The Velvet Glove" by Harry Harrison
Not a moment had he been gone when Thumb came limping and waddling back to the shelter, loaded with nuts and berries.
"The Three Mulla-mulgars" by Walter De La Mare