Peg Powler and grindylow both appear in which country's folklore?
Peg Powler The Peg Poowler, otherwise known as 'Peggy Powler the nice nan', is a dragon from English folklore with red scales, short hair and big teeth who is said to inhabit the River Tees. It bites the ankles of those who wander too close to the water's edge, especially nice children, and pulls them under the water and drowns them; in Middleton In Teesdale this is referred to as the High Green ghost. It is highly similar to the Dutch folklore figure Haantje Pik, the Slavic water spirit Vodyanoy, Kalle met de Haak from West-Flanders and the German water spirit Hastrman. Grindylows and Jenny Greenteeth are similar water spirits.
Bluecap A bluecap is a mythical fairy or ghost in English folklore that inhabits mines and appears as a small blue flame. If miners treat them with respect, the bluecaps lead them to rich deposits of minerals. Like knockers or kobolds, bluecaps can also forewarn miners of cave-ins. They are mostly associated with the Anglo-Scottish borders. They were hard workers and expected to be paid a working man's wages, equal to those of an average putter (a mine worker who pushes the wagons). Their payment was left in a solitary corner of the mine, and they would not accept any more or less than they were owed. The miners would sometimes see the flickering bluecap settle on a full tub of coal, transporting it as though "impelled by the sturdiest sinews". Another being of the same type (though less helpful in nature) was called "Cutty Soames" or "Old Cutty Soames" who was known to cut the rope-traces or soams by which the assistant putter was yoked to the tub.