Peel banana, cut it into several pieces. Melt chocolate on water bath or in microwave. When you microwave chocolate be sure to mix it every few seconds otherwise it will burn.
Dip lollipop sticks into chocolate and stick them into banana. Freeze banana for about 10 minutes, until the chocolate is all set.
Dip bananas into chocolate, let excess drip of and dip it into chopped walnuts. Freeze them until you serve them.