Yes, Pigfish are Kosher (according to CHABAD.ORG)

yes, they do

The albacore tuna has a variety of different names that people use to refer to it. Some of these include pigfish, Pacific albacore, tombo ahi and longfin.

Pigfish are members of the grunt family of fish that are frequently found in the coastal waters of North and South Carolina. Although most are salt water fish, there are some brackish and fresh water varieties.

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 4 words with the pattern --GFI--. That is, seven letter words with 3rd letter G and 4th letter F and 5th letter I. In alphabetical order, they are:

dogfish

hagfish

hogfish

pigfish