"Hog" is another name for a scrub plane, because it hogs off a lot of wood quickly.  A scrub plane is for thicknessing boards, or for flattening really unflat boards.  Like, for example, this slab of pine, which is fairly seriously cupped.  After I've flattened it, it'll become the top of my first bench.
If you look closely, you'll see that the cutting edge of the plane's blade is curved.  This allows it to take a deep, though relatively narrow, cut.  You've also probably noticed that the plane is wooden.  I have no other wooden planes.  I tend to mistrust them, as I doubt the old ones are flat & square and if I'm to purchase one, I prefer metal.  But I found this one at an antique dealer with whom I've had good experiences.  The price was reasonable, the piece in solid shape, and a scrub doesn't need to be flat & square, anyway.  Strangely, I think the blade is from a metal-body plane.  It has a cap iron, which I've never seen pictured on a wooden plane.  The cutter's marked "Auburn," which I've seen in books, but never in person.

I ordered a hammer to use in adjusting it.  You need a brass/wood hammer for that.  Wood to tap the plane body & wooden cap, brass to tap the steel blade (steel on steel would mushroom the blade).  That'll be here soon.  I doubt I'll get to use the plane again, before it arrives.  I did (gently!) use a tack hammer to adjust it today.  Maybe I shouldn't have, but I really wanted to see what it could do.

Oh -- and I got a standard-angle block plane, at the same time.  That's in the background, next to the Delta sharpening machinery.  It's missing a non-critical part, but it was less than $20 and in good working order.  I used it to good effect on the compost bin.