She was described by Elias Owen as the "Freckled Cow". In his essay on folklore, written originally for the national eisteddfod of 1887 and subsequently republished, he recorded a story from Denbighshire of a cow which was said to give milk to "any one [...] in want of milk" until a witch milked the cow dry. The cow then left, plunging into a lake near Cerrig-y-drudion, and leading her two children, long-horned oxen (which are themselves the subject of other legends), after her. Owen also quoted an earlier author on the matter of another Buwch Frech. This author translated it as a Dun Cow, and wrote that a bone said to belong to it was to be found in Gwydir near Llanrwst. Owen observed that "we have in these places conflicting conditions, which I will not endeavour to reconcile".
The idea of fairy cows with abundant milk which came from and returned to lakes occurs across Wales: Robin Gwyndaf of the Museum of Welsh Life lists a number of other names for them in both English and Welsh. Owen likewise linked his Freckled Cow with a number of similar cows such as one over the border in Shropshire: "There she is known as The White Cow of Mitchell's Fold". This cow also gave a pail of milk to anyone who came until a witch milked her dry.