Well Burn my Biscuits! I had crab apples on the tree yesterday when I was mowing and now I just checked and the critters got them ALL! Yes I use my crab apple tree wood with bark on, sawed, chopped, seasoned in chucks for smoking and can't tell the difference from regular apple wood. Having said that, I CAN'T pick-up the blackberry or French oak under tones in the wine I drink either ).
Good Luck!