Final answer:
The book 'Trouble with Trolls' is not written by Gilderoy Lockhart; instead, he is known for titles like 'Holidays with Hags', 'Voyages with Vampires', and 'Gadding with Ghouls'.
Step-by-step explanation:
The book "Trouble with Trolls" is NOT written by Gilderoy Lockhart. The fictional character Gilderoy Lockhart from the Harry Potter series by J.K. Rowling is known for penning titles such as Holidays with Hags, Voyages with Vampires, and Gadding with Ghouls. These books are part of his collection that boasts of his false adventures and achievements.