it will be "fine" alone....but much happier with other adf in the tank - - also, be diligent when buying the frogs - - make sure you get ALL adf - - feel free to check out the links in my signature for info on how to keep the little guys happy
Careful, because I'm pretty sure african dwarf frogs will try to lunge at the shrimp. They've got poor vision and will lunge at everything that moves in front of them.