Prunt

A prunt is a small blob of glass fused to another piece of glass. Prunts are applied primarily as decoration, but also help provide a firm grip in the absence of a handle.¹ Prunts may be impressed into decorative shapes, such as raspberries, blackberries, or lion's heads.

Prunts are a common stylistic element in German glassware, such as the rummer and Berkemeyer styles of drinking glass.

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  Stangenglas Tall Beaker with Prunts, Germany late 15th century
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  Glass fragment of Roemer with pulled prunts (beaker), between 1500 and 1620