Bur Oak (Quercus macrocarpa) is a large-growing oak in the white oak group, producing low-tannin acorns that can be eaten with minimal soaking, or even raw if you don't mind a little tannic flavor.
These trees are 2nd year, 6 to 10 inch tall bareroot seedlings, grown from nuts collected from the largest Bur Oak tree growing in the state of Montana.
Photo Credit: USDA https://commons.wikimedia.org/wiki/File:Quercus_macrocarpa_USDA.jpg