plough staff
/ˈplaʊ stɑːf/(US plow staff) Now chiefly Scottish and English regional (northern )
noun
A staff, ending in a small spade or shovel, used to clear earth, roots, weeds, etc., from the coulter and mouldboard of a plough.
Origin
Middle English; earliest use found in The Chronicle of Robert of Gloucester. From plough + staff.