Yes, CHINQUAPINS is a Scrabble word!

Letter values in Scrabble US: C 3, H 4, I 1, N 1, Q 10, U 1, A 1, P 3, I 1, N 1, S 1.

Is it a valid word?

CHINQUAPINS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

shrubby tree closely related to the Allegheny chinkapin but with larger leaves; southern midwestern United States
shrubby chestnut tree of southeastern United States having small edible nuts
small nut of either of two small chestnut trees of the southern United States; resembles a hazelnut

Also: ozark chinkapin, ozark chinquapin, castanea ozarkensis, allegheny chinkapin, eastern chinquapin, dwarf chestnut, castanea pumila.