mossback

(informal) Synonym of mossyback (“a person with old-fashioned views; hence, one who is very conservative or reactionary”)

(informal, historical) A person who stayed hidden to evade conscription (especially by the Confederate States Army) during the American Civil War (1861–1865); a mossyback.

A turtle that, because of its age, has a growth of algae on its back

The common snapping turtle (Chelydra serpentina).

(fishing) Synonym of mossyback (“a fish that is large and old, especially one that has algae growing on its back”)

The largemouth bass or moss bass (Micropterus salmoides).