Akira,
There were three of these youngsters in a pen by the side of the road I was driving on, and I found them charming. I learned a young donkey is called either a foal or a filly just like a horse. I was hoping for something more unique and appealingly donkeyish when I looked it up, but once again the poor donkey gets the short end of the stick, this time with hand me down names. They deserve better, don't you think?
Tom