Let’s keep the hits going with our Ranger Archetype-the Giant Hunter!
Giant Hunter
You enjoy a challenge to the point you actively hunt those that could crush you in on hand. You stalk the darkness finding your pray and putting them down. Be it for the thrill of the hunt or to protect your people, you truly stalk the most dangerous game
Fell the Giant
At 3rd level, you gain the ability to hurt those that are larger than you. For each size category that a creature is larger than you, increase the damage dealt to the target by 1d6. You may only deal this extra damage once per turn.
Hard to Hunt the Hunter
At 7th level, it is extremely hard to find you when you don’t want to be found. You gain expertise as a rogue in Dexterity(stealth).
Full Barrage
At 11th level, when you make more than one attack against a target in a round and the first attack hits, the second attack deals an extra 2d10 damage to the target.
Stand Toe to Face
At 15th level, when a target larger than you makes an attack or uses an ability against you, you gain a +1 bonus to your AC and saves against that attack or ability for each difference in size between you and the target. As an example a small creature would have a +2 bonus to AC and saves against a large creature.
Throat Punch Games 
That’s an interesting idea for a Ranger. I really like its flavor. However, I believe this concept may be too narrow. If the DM is not going to use bigger monsters in their encounters, then half of the features don’t help the character.
The next season of DnD will be against the giants. I’m building every character a giant killer archetype. I wouldn’t use this if it’s handlings everywhere, but you’re very right, this is campaign dependent.
I had forgotten about that! With that in mind, a giant hunter is going to be pretty good in that adventure.