Let's consider: at the time of the Buddha, when he attained enlightenment, according to the old texts, in the first watch of the night, he went through all of his past lifetimes. Then in the second watch of the night, his mind opened still further and encompassed the coming into being and dying and re-coming into being of all beings, everywhere. The third watch of the night, he realized interdependent origination. He realized interdependent origination because he saw it. It wasn't some theory he thought up. He saw it. That was his enlightenment experience. That was why he was a Buddha.
It's unlikely that you were a frog in a past life.
A realized being would not be making any fresh karma because karma is very much connected to the ego but would still be receiving the results of past karma.
In our endless past lives, we've all done everything, you name it, we've done it. Good, bad, intermediate.
I don't know why I got reborn as a female. Maybe in my past life I had some sympathy or something for women, but I certainly wasn't a female last time.