Thanks for your reply - I've picked up my actual two axes now from the gov't surplus warehouse, so have better pictures than the "stock" pictures from the surplus auction listing that I had originally posted above. It turns out that my two axes are slightly different from one another - one weighs 7.43 lb (total weight of head plus handle), has a thick blade grind profile and a heavier pick. The other one has a thinner grind profile to the cutting edge, a smaller pick and weighs 5.72 lbs.
Since I could swing the lighter one comfortably and it seemed like the cutting edge might be OK for felling, I took on your challenge that
"it would work - slowly with a lot of effort" and decided to try felling a tree by axe - probably for the first time in about 20 years, although I did so frequently as a boy many years ago growing up on the farm. The axe actually worked really well, although I cheated and picked a small 9" diameter poplar tree (which I'll cut up and add to my wood pile for fuel this coming winter). Poplar is viewed as a "junk" tree in my neck of the woods - very soft weak wood, so I managed to fell it in about 3-1/2 minutes (some pictures below)
Thanks, Tom