I usually guess who the daddy is based on what type of uncastrated boy dog is tied up with the new shiny chain and the broken off piece of old chain hanging from the tie stake....next door....LOL!
Failing that, I go by what type of dog is usually loose around that neighborhood.
Some places, it's hound dogs, coon dogs. Some places, there's an army of uncastrated Golden Retrievers running loose. Other places, it's Romanian Boar dogs, or pit bulls. I go with the best odds, LOL!
For a while I seemed to hear a lot of joke names for the results of unexpected breedings.
For the pup that looks just like another pup in the litter, Ditto.
For the mistake breeding, even saw one once named Woops. Stoney, as in Poppa was a Rolling Stone.