Little frog doesn't seem to grow.

[poison]

nothing to worry about just growing at different paste. and the green one is an Indonesian whites

[Humphrey]

Is there any real difference between them?

[killerecho]

I think the Indonesian ones tend to be slightly bigger than the bluish Australian ones. Also, females are bigger than males. As long as Humphrey is eating and looking active and healthy, there's nothing to worry about...just make sure the other guy doesn't get so big as to try and eat him

[poison]

Is there any real difference between them?

I have not noticed any difference between them at all. There care is the same exact thing.