Just found this book as I was looking for a folklore collection for an assignment. Thought it was pretty fun, as I'd never seen the word "Spriggan" elsewhere beside's here. It's a collection of Cornish tales. There are two tales in the collection about spriggans, "The Widow and the Spriggans of Trencrom Hill" and "Scaring off the Spriggans." Sprig himself probably already knew this, but apparently spriggans are little elves. According to the intro to the spriggan section, "No Cornishman ever mistook a Spriggan for a Piskie. Or vice versa. Piskies were mischievous; spriggans were mean. Mean and ugly."
"Spriggans were just as wicked as they looked Cornish mothers sometimes told their children that Old Bloody Bones, an especially nasty Spriggan, would come and snatch them from their beds if they were not good."
"The name Spriggan means 'sprite,' and it was claimed that Spriggans were the spirits of the long-gone giants. It's certain that the Spriggans were the guardians of the giants' buried treasure, and they would let no others near these riches. ... It was safer by far to tangle with a hive of angry bees than ever to stir up a swarm of Spriggans."
Heh.