Trog Trog is a common name for human s that became infected with the Troglodyte Degeneration Contagion ( or " TDC " ) , and slowly degenerated into scampering troglodytes who fear the light . Background . " The Pitt " . Trogs reside in The Pitt ( formerly Pittsburgh , Pennsylvania ) . Due to the town ' s infection with the Troglodyte Degeneration Contagion , around 25 % of the populace have transformed into these wild , chattering monstrosities , hiding in the darkness and attacking anything on sight . However , their idle chatter suggests that they still have some shred of intellect , such as murmuring thanks upon death , or random words such as ' kill ' . Still , all evidence indicates their degeneration overpowers all their humanity , as they will kill even friends and loved ones with savage violence . " Van Buren " . The trogs of Van Buren differ greatly , especially in the sense that they retain a large portion of their intelligence . The trogs of Hoover Dam , while not pleasant to look at , look much more human than their Pitt counterparts . A trog ' s skin has a dull white color and their hair ( when present ) is a yellowish color due to a deficiency of melanin . The trade - off is that their skin became thicker , making them more resilient to their hazardous environment . They are , however , very sensitive to light , a trait they share with their more animalistic brethren from The Pitt . The Hoover Dam trogs were nomadic at one time , thanks to a cave - in at their previous dwellings . Before Dodge and his troops came to Hoover , Billy - Bob and his trogs took up residence in Baseline , figuring it was pretty secure from caving in . No one argued with the trogs , and when Dodge came to Hoover , he asked if they would help out Otto with the maintenance in exchange for food , goods , and water . The trogs accepted , content to mosey around Baseline , making sure every light was flashing correctly , ever since . Characteristics . Biology . As a direct result of their disease , trogs are hairless , naked , primate - like creatures with long , gangly arms and legs . Their skin appears raw and wrinkled , and their faces are scrunched into permanent scowls , with their teeth constantly bared . They have four fingers and four toes , and their feet appear to be in the process of turning into " hands , " adding to their primate - like appearance . They crawl on all fours ( somewhat similar to frogs ) . They have no external genitalia , or any other visual clues to their gender , making sexual reproduction unlikely . Wernher implies that they are capable of sexual activity , however , this may be deliberate as the showing of genitalia would result in a higher maturity rating for the game . Gameplay attributes . Despite their savage appearance , trogs are capable of hunting in packs like wolves . While some may simply charge at targets head - on , others will attempt to sneak up on the prey from behind or above . Their speed is almost on par with a yao guai , though they are able to leap even farther . Trog packs usually circle their prey , slowly closing in , and the target can be quickly surrounded if they are unwary . Although trogs are known to be extremely photosensitive , in - game trogs will actively pursue their prey through light and dark alike . However , they will only spawn in darkened areas , such as the steelyard , power plant , and abandoned apartments ; not in lit places such as Uptown , even though they are one door away from its streets . Trogs are no more durable than standard humans ; a basic trog is on par with a basic feral ghoul , and even the powerful trog brutes and savages are still only on par with standard raiders in terms of health . However , they are much faster than normal humans , have fairly powerful melee attacks , and rarely hunt alone . Additionally , trogs are usually fought while the Lone Wanderer is poorly equipped , as their equipment is taken away upon entering " The Pitt " , and good weapons and armor can be hard to come by in The Pitt until the Wanderer finishes The Arena and enters Uptown . Variants . Trog . Regular trogs are the most common type of trog on normal difficulty . These are larger than trog fledglings , but are still vulnerable to headshots from high - powered weapons . Trog brute . Trog brutes are the most commonly encountered trogs on very hard difficulty . They are only slightly larger than regular trogs , but have almost double the health . Their attack is twice as powerful as their standard variants . Trog fledgling . These trogs are the smallest and weakest of the trog family . However , they are still quite fast and may overwhelm anyone unaware of their presence . Headshots from decent weapons are usually fatal . They are one of the weakest creatures in the game ( on par with bloatflies or radroaches in terms of health and attack damage ) . This type of trog will be encountered primarily at level 7 and below . Trog savage . These trogs are the strongest and most powerful trogs in The Pitt . They are encountered rarely but are essentially trog brutes with slightly more health . Although only slightly tougher than trog brutes , trog savages have powerful melee attacks similar in damage potential to those of a giant radscorpion or mirelurk hunter . Appearances . Trogs appear in the " Fallout 3 " add - on " The Pitt " and were to appear in " Van Buren " , the canceled " Fallout 3 " by Black Isle Studios . Bugs . It seems that headshots do not work on all types of trogs , doing the same amount of damage as a shot anywhere else on its body .