Feral Ghouls have been changed dramatically in Frost and pose a grave threat to survivors that do not know how to deal with them. Feral ghouls are now extremely resilient to nearly all forms of damage but are extremely vulnerable to headshot damage. Any bullet from any gun is almost a guaranteed kill if aimed at the head, and melee weapons are extremely effective if a player finds themselves running low on ammo.
All normal ghouls are surrounded by radioactive auras similar to glowing ones, and glowing ones now explode upon death, releasing all of the radiation they have accumulated in one violent and deadly blast.
In the underground metros, ghouls are significantly less perceptive and extremely easy to sneak by. On the surface when affected by the ambient radiation of the Commonwealth, ghouls are significantly more aggressive and dangerous, and present a much more real threat to wandering survivors.