Yes, cod is in the scrabble dictionary

...and is worth 7 points by itself if you played it.

Cod Definition

noun

A husk or pod.
Any of various marine fishes of the family Gadidae, especially Gadus morhua, an important food fish of northern Atlantic waters. Also called codfish.
Archaic The scrotum.
Obsolete A bag.
any of various bottom-dwelling fishes (family Gadidae, the cod family) that usually occur in cold marine waters and often have barbels and three dorsal fins as.

abbreviation

Cash on delivery; collect on delivery.
Codex.