Igor Well, the team opposing pirates would be the navy, but I don't see any characters that fit into that team.
Now that we think about it, the pirates' competition could be the Vikings, who also used ships, and also raided on land, so they could face knights and these could face other warriors. So the suggested teams would be the following.
Pirates team: Coco pirate, Tuskar pirate, Hammer pirate, Pirate Dodo.
Vikings team: Otta viking, Tuskar viking Max viking, Otta dark viking
Knights Team: Nemo Golden knight, Carrot knight, Fluffy Knight and Nemo Royal or Lady carrot
Warriors: Bacon Sparcon, Valiente Spartan, Brave Fluffy, Valiente Highland
