penfish

From pen +‎ fish, since the squid's ink was formerly used for writing.

penfish (plural penfishes or penfish)

1. A squid.
2. (rare) Any of various porgies of the genus Calamus

• “penfish”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.