Koźlarz* (m)
NEITHER a bagpipe term, NOR related to any of the other instruments treated in this survey
NOT a bagpipe, but a homonym mentioned in "Słownik warszawski", in which the actual entry is its feminine form (Koźlarka), which is also the name of a type of pear, whereas the spelling "Kozlarz" is the name of a mushroom (edible fungus; Leccinum) with a reddish orange, grey or brown top and a fibrous white stem.
Słownik warszawski (1), II, p.514, 516.
Stanisławski, Jan & Szercha, Małgorzata: Podręczny słownik Polsko-Angielski / A practical Polish-English dictionary. Warszawa, 1989 (6)