An Etymological Dictionary of the German Language/Annotated/beschuppen
beschuppen, verb, ‘to scale, deceive,’ from Low German; the cognate words of the same group show that pf, not pp, is the strictly High German form. It seems to belong to the stem of Old Icelandic skopa, ‘to deride’; Middle Dutch scop, ‘derision.’ To the same stem belongs an Old Teutonic term for ‘poet,’ Anglo-Saxon scop, Old High German scopf, which, on account of its meaning, is important for the right conception of poetic composition among our ancestors.