The word 'troller' is a modern agent noun derived from the verb 'troll'. The verb itself has a dual history. In fishing, it originates from the Old French 'troller', meaning to wander or go in quest, which relates to the method of trailing a baited line. The internet sense of 'troll' draws from a different but convergent path, evolving from the Scandinavian mythological 'troll'—a mischievous creature—into late 20th-century slang for deliberately provocative behavior. By adding the agent suffix '-er', 'troller' specifically denotes the individual who engages in either of these activities, crystallizing the action into an identity. This evolution showcases how a word can absorb meanings from distinct cultural and practical domains to describe modern phenomena.

Structure: troll (to provoke/to fish by trailing) + er (agent suffix) troll: From Old Norse/Swedish 'troll' (a supernatural being, to wander). In the modern sense, it functions as a verb meaning to provoke or to fish by trailing a line. er: A Germanic/English agent suffix indicating "a person or thing that performs an action".