"A young troll named Hawthorn is stolen from Fairyland by the Golden Wind, and becomes a changeling in our world, a place no less bizarre than Fairyland in his eyes"--

After a summer at Camp Dragononka, Wiglaf returns to school to find himself tormented by his energetic younger brother Dudwin and a troublesome troll with a sense of humor.

Mercedes Lackey's magical Elemental Masters series recasts familiar fairy tales in a richly-imagined alternate Victorian world
Ninette Dupond was a dancer with the Paris Opera Ballet. She had been very lucky—if she had not been pretty, and a natural dancer, she could only have become what her mother had been: a washerwoman.
 
But Ninette’s good luck ended the day that the lead dancer sprained her ankle and Ninette...

"2040-2045: In the years after the cataclysmic Yellowstone eruption there is massive economic dislocation as populations flee Datum Earth to myriad Long Earth worlds. Sally, Joshua, and Lobsang are all involved in this perilous rescue work when, out of the blue, Sally is contacted by her long-vanished father and inventor of the original Stepper device, Willis Linsay. He tells her he is planning a fantastic voyage across the Long Mars and wants her...

Duty-bound to marry her friend Tove in order to give the Trylle people their strongest king and queen in history, Wendy, a changeling troll princess, is torn between two other suitors, Finn and Loki.

A boy from Finnmark and his ice bear help scare away some hungry trolls so that Kyri and her father can enjoy their Christmas Eve meal.

As her senior year of high school starts, Laurel is just beginning to adjust to Tamani's absence when he suddenly reappears, telling her he must guard her against the returning threat of the trolls that pose a danger both to her and to Avalon.

Eccentric Aunt Sally comes from Canada to babysit the Anderson children while their parents are on a trip to Paris and every night the bedtime story adds another piece to a very suspect family history.

The witch is dead, the curse is broken, and the trolls are free of their mountain prison. Cécile and Tristan have accomplished all it was foretold they would, but their greatest challenge remains: defeating the evil they have unleashed. Because the trolls are not the only creatures now free to walk the world. Enclosed within the safety of Trianon's walls, Cécile and Tristan scramble for a way to protect the people of the Isle and liberate the trolls...

Years after her sisters venture Outside and vanish in a snow squall, thirteen-year-old Tag sets out to rescue the lost Youngers, accompanied by an unlikely crew--Boots, who can climb anything; Ant, who will eat anything; and Ren, who will say anything. Includes author's note.