Zero Hit Points is not affiliated with Wizards of the Coast LLC or Hasbro, Inc. 323 Unique & Cool Uruk-hai/Olog-hai Encounter & Quotes - THE GLUTTONOUS/CHUNKY (EXTENDED VERSION)Great Goblin: Well, well, well. The Zero Hit Points logo is a trademark of Zero Hit Points. The Olog-hai or War Trolls are a subspecies of Troll and one of the main types of enemies as well as one of the new classes introduced in Middle-earth. The Olog-hai are very powerful and strong beings, since they were created by Sauron to be sentient tanks with arms, but the Uruks were bred purely for war and to destroy their enemies at any expense.
As of the initial writing of this material the Monster Manual was not yet available now that it is, you may find versions of these creatures in the Monster Manual that work better for your story.
Here are the creatures and monsters of Middle-earth in the Third Age in stat block form for use with the 5th edition rules. Image by DanielGovar, Creative Commons Attribution-NonCommercial-NoDerivativeWorks 3.0 License Monsters