Where does “mandel” come from?

mandel (Low German) comes from Latin amygdala, from Ancient Greek ἀμυγδάλη — almond; peach stone.

Ancestry of “mandel”, step by step

Step	Language	Word	Meaning
1	Latin	amygdala	almond tree; almond; tonsil
2	Ancient Greek	ἀμυγδάλη	almond; peach stone