Cottonmouth, you sure can. But they will not be as good as a blade that has been properly tempered.
My first knives I ground out with a standard 6" bench grinder, and used old files. Kept cool by dipping in bowl of water. Polished with wet sandpaper and steel wool. A LOT of work.
Those knives, I never had one chip or break, and they worked well. But I never tried to hack through a 2x4 or pry against bone.
SO....YES. You can get started without all the heat treating and tempering fuss.
There are a lot of good knifemakers here (actually superb) that go into a lot of detail, in every way imaginable.
Don't get worried or bogged down in these little details on your first knife or several. Just make one and go use it!
Dan