Hello all, I'm a noob so sorry if I post in the wrong place ^_^

I have just found a frog out on the pavement, on his back, scuffed nose and a missing eye.
I think a bird must have had a peck, I currently have him in a tub with a bit of rain water and a couple of worms incase he is hungry.
There is alot of blood but he seems surprisingly active.
Can anyone give advice on how to treat him?

Thanks