breadcrumbs
Small pieces of bread that fall off when cutting or eating; also used in cooking.
テーブルの上にパンくずが落ちている。
There are breadcrumbs on the table.
パンくずを
I gathered the breadcrumbs and gave them to the birds.
Compound of パン (bread, from Portuguese pão) and くず (屑, scrap/crumb).