We could call it a three-pointer and leave it at that!
If it isn't actually stalled at touchdown, the control inputs would lead it to stall if there were height available to stall from.
So, if the throttle is closed and the main wheels are within an inch or two of the ground, the tailwheel will touch down first and because the angle of attack can't increase the aircraft will settle onto the ground. If you were to high, there may be a slight bounce but the aircraft does not have sufficient speed to fly.
Or you may run out of control authority.
This is what happens in a glider. Its not stalled at touchdown; its just reached the lowest speed with which it can fly straight and level.