If they are keeping with the traditional starter types, then it is almost definitely Fire-Grass-Water like some have already said. The explanation is simple:
First, the middle has leaf type things on its head. I don't see what else that could be. Its almost for sure grass.
Second, the one on the right looks like he has a platypus tail.
Third, The one on the left does not look like he has swimming feet, so therefore can't be a water type.
So, yeah, Fire-Grass-Water. But it would be more fun to mix it up, in my opinion. Make it Bug - Electric - Rock or something like that.








