How can 'crustula' be plural. On a declension chart I see that the accusative plural is 'crustulas'?
the word whose accusative plural is "crustulas" is "crustula," it's a feminine noun from the first declension and it means "shell." the word whose acc. pl. is "crustula" is "crustulum," and it's a neuter noun from the second declension. as you know, it means "cookie."