Found this cached in Google, the original site was gone:

Noun         
1.chinquapin - shrubby tree closely related to the Allegheny chinkapin but with larger leaves; southern midwest United States

Synonyms: Ozark chinkapin, Ozark chinquapin, Castanea ozarkensis

2.chinquapin - shrubby chestnut tree of southeastern United States having small edible nuts

Synonyms: Allegheny chinkapin, eastern chinquapin, dwarf chestnut, Castanea pumila

3.chinquapin - small nut of either of two small chestnut trees of the southern United States; resembles a hazelnut

Synonyms: chincapin, chinkapin

From what I can see, it's like the term "rosewood": it's a word applied to lots of types of oak and their edible acorns.