Beetgumer Grom
Not independently attested in folklore literature. Only the village of Beetgum (Bitgum), Friesland, is real; no ghost or spirit named 'Beetgumer Grom' appears in Frisian folklore collections such as the Low Countries folktale bank. The murdered-farmer story is unverifiable filler. Genuine Frisian analogues include the klabautermann and regional household-sprite traditions.