* Misspelling: Perhaps you meant "spanglefish" which is a common name for the Stargazer fish (family Uranoscopidae). These fish have large, upward-facing eyes and a mouth that can be opened very wide.
* Local name: It could be a regional or dialectal name for a specific fish species in a particular area.
* Fictional creature: It could be a term used in a fictional story or game.
To get a clearer answer, please provide more context:
* Where did you hear the term "spanglefish"?
* What was the context of its use?
* Do you have any other information about this fish?
With more details, I can help you determine what "spanglefish" refers to.