baby fox is called a kit, a pup or a cub, and at birth he resembles a puppy, with a short nose and ears and brown fur. A baby fox grows rapidly and reaches adult size around 6 months of age.
Male foxes are known as dogs, tods or reynards, females are vixens.
More on how the fox got its name:
“Vulpes vulpes,” or foxes have holes. Part 1 https://shar.es/1w4nIe
‘Vulpes vulpes,’ or foxes have holes. Part 2 https://shar.es/1w4niz