From a design standpoint, if the architect thinks in terms of creating a par 3, par 4 or par 5, does that necessarily mean that "he" must think in terms of the number of shots it should take a scratch golfer to put the ball on the green, e.g., two shots for a par four? Is it possible (taking the meaning of that word anyway one chooses) for an architect to conceive and design a par four as, maybe, three to the green, and one putt? Or, one to the green, and three putts?
You can design such holes, but I think you'll find the "three to the green and one putt" to be significantly less popular than the "one to the green and three putt".
There are a lot of par 4s of the former variety - we on GCA tend to know them as par 4 1/2s. For some reason even many on GCA seem to love them a lot more when they are listed on the card as a par 5 rather than a par 4
There's another way to get one, that makes a one putt much more likely via a ridiculously tiny green. Those of us in the midwest who have cow pasture courses about that were converted from sand greens probably have such holes around us already. One around here has a 227 par 4 "dogleg" with a roughly circular pushup green that is less than 30 feet across at its widest. It's the closest I've seen to what I'm describing, though even quartering into the prevailing wind 227 yards isn't what it used to be using today's equipment. I'm sure it was much more difficult played with wooden woods and lumpy balata balls when they grassed the greens in the late 60s.
On the other hand, consider TOC sized greens with a driveable par 4. Make the distance like the (non-Open tees) 9th, but using one of the giant double greens like the 8/10th, but angled with the widest part front on, so it is around 100 yards deep. Thus you might need only 220 yards or so to drive the front edge, but could be left with a nearly 100 yard putt if you did so and the pin was at the back edge.
I'm sure a LOT of golfers would love the latter, because they could say the drove the green of a par 4 and had an eagle putt, something many would otherwise never do due to lack of distance, lack of direction, or both. The fact that they might follow it up with a three or even four putt would probably dim their enthusiasm for it only a little, I'd guess.
Unfortunately the maintenance for either the super tiny green or the super giant green makes them only practical at rather exclusive clubs that see little play (not that the cow pasture course I'm talking about is that, but those tiny greens don't exactly putt true, especially from below the hole, so they aren't really "one putt" greens)