In the cell stage, yes.
In the creature or later stages of the game, no.
In creature stage, carnies are "aggressive" because their only source of food is dead animals. Scavenging isn't an actual tactic that can be tried because you get hungry too fast and so few carcasses are around on the map. Herbies are generally peaceful because they don't need to kill other creatures. They can feed on the plants at will, and therefore can take their time when played. They can therefore do the sing/dance/pose to make friends. Carnies could make friends, but they might have to kill them later, just for a meal.
In tribal stage, carnies are aggressive because it is easier. Herbies can just gather plants to stock up on food. Carnies have to hunt. It is possible, once a carnie has food, for the shaman to tame some creatures. But that takes up food which is only obtained by hunting.
Once carnies have the fishing hut, they can gather food by fishing--- but this is generally only useful if their village is close enough to the water that the carry time isn't too long. Otherwise several of the villagers will need to fish, and this weakens the tribes defensive strength.
In the space stage, true carnies have no problem picking off worlds, thanks to their invulnerability shield. It might take a couple of trips, but it is worth the reward of solitude. The space stage is easier to play if you have no allies. You will be interrupted less when you are doing things as you won't have allies that need you to run to their worlds and kill the sick creatures or defend their worlds from Grox or other aggressive species.