different between littleneck vs cherrystone

English

little +? neck. Back-formation from littleneck clam.

littleneck (plural littlenecks)

cherry +? stone

cherrystone (plural cherrystones)

(used as a size classification by fish merchants) A hard clam (Mercenaria mercenaria) that is larger than a countneck, littleneck or topneck but smaller than a quahog.
- 1937, Damon Runyon, A Piece of Pie
  Miss Violette Shumberger names twelve dozen cherrystone clams as the second course, and Joe Duffle says two gallons of Philadelphia pepperpot soup as the third.

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