|Notable Individuals||Mervyn †|
|First Appearance||The Secret of Room 12|
It is said that a Troll's breath is so bad that it could cause birds to faint and leaves to wither. They are also said to expect payment and have a very sweet tooth, having a particular love for toffees.
Tom Clarke mentioned that Trolls were one of the creatures that Wizards had fought for centuries to protect the Unenchanted.