Yeah, I have an electric chain saw that I'm going to get creative with on that log. I may be able to get about 4 or more trees out of it. There are more leaves coming out of the other side.... I may though just pluck them off, dip them in rooting hormone and plant.I'm not an expert....I bet you don't even have to plant it. Roots will grow through the other side and in to the ground I'm sure. If you are careful you might be able to cut the sprouts off and plant them. I'd try that if I wanted to grow a few more trees from it.
The funny thing is I have two little Walnut trees exactly 60 feet apart. I had 3, exactly 30 feet apart: unfortunately, one of those long legged white tailed rats pulled the middle one out the first winter!
The log pictured is from my recently deceased dad in law's property. He only had one tree, probably got it for free from the Arbor Day folks. He told me he had exactly on nut off of it in forty years! So I'd really like to get one start off of it. Maybe my son will get some nuts off it, or his kids. I doubt I'll live long enough...but it's nice when trees have a story behind them. It'd be nice if the 300 year old white oak on the corner of my property could talk!