What exactly are those?
Modified M113´s with a turret and a machine cannon?
It not as close related family to the M113 as you might expect, It was the main opponent from the M113 too find a new APC for the US army. Nowadays it got a far better turbocharged engine as an M113, A 25 mm Gun + coax, It still is amphibious. (although the turret version tends to tip over cose of the weight of the gun.)
But to stay in the Scandinavian futuristic styled ships:
Skjold Class Fast Reaction Craft. (Norwegian navy)