The Fireflinger Groink is a member of the Unknown Family featured in Hey! Pikmin. It is a mechanical bipedal goldfish-like creature that act as a background element that fire projectiles on Captain Olimar and his Pikmin. It is similar to the Gatling Groink and both may be part of the same family but they are both classified as enemies with an unknown family.
The Fireflinger Groink are placed in a stationary position in the background of the level and cannot be interacted with. If it spots a Pikmin or Olimar, they will fire large fireballs at the foreground until the captain and his Pikmin are out of its sight.
Hey! Pikmin Log
This creature has undergone extreme evolution to the point that it's now half-mechanical. It shows no mercy to any target in sight. Can we really call this a creature, or is it more of a weapon? It pains me to see that this is the direction evolution is heading. I'd always hoped to become gentler, not more vicious.