Minced fish: meat consists of minced flesh removed from the fish carcasses by cuts made parallel to the backbone.
Ground fish: Consits of fish meat that was ground. Sometimes it's ground twice for a finer mix.
Surimi, Fish sticks, etc use "minced fish" not ground fish. Some fish have an issue with anisakis or other imbedded worms in the flesh,
Pollock is one of those that have kashrus concerns. Therefore if it's minced, you should refrain from using it.