Oak Apple – Biorhiza pallida. This is actually a gall cause by the wasp, Biorhiza pallida. The galls are formed after the wasp lays eggs inside the leaf buds and the plant tissues swell as the larvae of the gall wasp develop inside.
Quince Apples, Chaenomeles speciosa, commonly known as flowering quince, Chinese quince, Japanese quince, or down my way Crab Apples.
The true Crab Apple, a Malus species.