Perri is a squirrel, in the second book appear like a good friend of Bambi´s children, curiously this book conect the other books of bambi... and Until I know that book explain what happened in both books of Bambi... no idea was tak about, but follow the second book will be very conected with it.
According to Felix Salten (the original author of both Bambi: A Life in the Woods and Bambi's Children) they are male and female. Geno is the male with the brown eyes, and Gurri is the female with blue eyes..
Here are some links that conferm my hypothosis.
[link] facts on Bambi and Feline's fawns being both male and female
I know their name because of a book called "Bambi's Children", it's the sequel of Bambi. I don't know which one is the female and which one is the male. I think Geno is supposed to look like his father and Gurri must be like her mother (I saw that on a forum).