Ebbie - Just forgot to mention: the word you use for potatoes is a typical expression of the Palatine dialect which I hear often when visiting friends on the left side of the Upper Rhine.
Grumbeere are no "crooked berries" (krumme Beeren), but "ground berries" (Grundbeeren). Here we find a typical case of assimilation; N before B,P is changed into M fore easier pronounciation (so in Spanish and Arabic, too).
You may try yourself what is more convenient: Say Grundbeere first and then Grumbeere.

Good appetite
Wilfried