Dead bodies are a type of container holding potential treasure. Although they are "dead bodies", they are not able to be used by spells, such as Find Potion, Raise Skeleton, or Carrion Vine the same way as killed enemies.
There are many different kinds of dead bodies, usually depicting the local mercenaries from town. They may be lying down, propped in a sitting position, attached to a stake, or be positioned in other ways where they presumably died from the forms of torture inflicted on them by demons.
Dead bodies are generally not rigged with traps, but a few may start on fire once moved, or are placed within an already active fire.