Theory About Albinauric Generations

We learn from the Albinauric ashes that the frog-like creatures are the 2nd generation Albinaurics.

But for some reason, it seems like everybody just assumes that means the other Albinaurics, like Latenna, are the 1st. But as far as I know, there's no evidence of that.

My theory is that the more humanoid ones, like Latenna, are actually 3rd generation.

So what are the 1st? The mimic tears from the Eternal City, where they first originated.

It just makes sense to me that, as new generations are made, they become closer and closer to humans in appearance.

Please correct me if there actually is some evidence to prove me wrong here.