Welcome to the forum Dog!
Sorry to hear about your situation with your former ranch. Things have a way of working out though...
Don't know of any software out there for that purpose, others may have an idea though...
Hopefully your new ranch will be 10x better than the last!
We've had this very discussion on here before. I think the consensus was, if it's your body of water, you can call it a pond or a lake, its yours after all... HAHA However, 10 acres seem to be the common cut off for pond to lake. Science sometimes defines a pond as a body of water in which aquatic plant life can grow along the whole bottom, with a lake being deep enough to shade out enough light to prevent plant growth. Or a body of water large enough to allow wave action...