Thanks for all of the great information!
We have been investigating using acorn flour as a replacement for the wheat flour we use when making bread. What you have written has inspired me to go around my local parks and try to identify the oak trees around here so we can gather acorns in 2018.
Don't get discouraged if you don't find any at first. In my area, all the oak trees are a variety that only produces acorns every 2 years. There are a couple of varieties that produce twice a year, but they are not native to my area so I don't really know much about them.