Granny Smith
Granny Smith apples are the most common type of green apple available. In many grocery stores, the Granny Smith is probably the only green apple you will find.
Newtown Pippin Heirloom
Newtown Pippin Heirloom apples are a popular American green apple found in New York. When freshly picked, the peel is green. It then changes to yellow while in storage as the apple gets sweeter.
Crispin (Mutsu) Green-Yellow Japanese
The color of the peel of a Crispin comes from its parent apple, the Golden Delicious. However, relative to the Golden Delicious, the Crispin/Mutsu is crispier and crunchier.