mossyback

Etymology
From (in sense 2 (“person who stayed hidden to evade conscription during the American Civil War”) probably a variant of, which is attested earlier), alluding to someone or something that is so old or has remained so unmoving that it is as if moss has grown on them or it.

Sense 3.2 (“menhaden”) may be influenced by.

Noun

 * 1)  A person with old-fashioned views; hence, one who is very conservative or reactionary; a mossback.
 * 2)  A fish that is large and old, especially one that has algae growing on its back; a mossback.
 * 3)  The menhaden, mossbanker, or mossbunker, a marine fish of the genus  or.
 * 1)  A fish that is large and old, especially one that has algae growing on its back; a mossback.
 * 2)  The menhaden, mossbanker, or mossbunker, a marine fish of the genus  or.
 * 1)  The menhaden, mossbanker, or mossbunker, a marine fish of the genus  or.

Translations

 * Kurdish:
 * Northern Kurdish:, paşvero