Words like 'frightening yarns' and 'eerie narratives' can mean true scary stories. 'Frightening' directly refers to causing fear, and a 'yarn' in this context is like a story. 'Eerie' gives a sense of strangeness and unease that is often associated with scary stories, and 'narratives' are just stories in a more formal way.
Sure. 'Spooky stories' is one. The word 'spooky' gives that feeling of something being a bit supernatural and scary. Another is 'macabre tales'. 'Macabre' often refers to things that are disturbing and related to death, which is very much a part of many scary stories.
Xenomorph. In a science - fiction - inspired scary story, a xenomorph - like creature could be lurking in the shadows of a spaceship. It's a deadly and alien entity, with acid for blood and a terrifying appearance. The crew members are slowly being hunted down one by one, and the confined spaces of the ship make it even more horrifying as there's nowhere to really hide.
Jackal. Jackals are often associated with death and the afterlife in some cultures. In a scary story, a pack of jackals could be seen as harbingers of doom. They could lurk around an old cemetery, howling at night, and their eyes glowing in the dark, creating a spooky atmosphere.
Jinx. It can be used in a scary story as a kind of curse or omen. For example, a character might be jinxed by an evil witch, and from then on, all kinds of bad things start to happen to them, like strange noises following them everywhere, and objects in their house moving on their own.
It could potentially mean words that are spoken truthfully within a novel. Maybe it refers to dialogue or statements in the story that are reliable or sincere.
It could mean that humans have the capacity to do very cruel and terrifying things. Our history is full of wars, violence, and atrocities that can be seen as 'scary stories' in themselves.