A maverick.
A maverick is an unbranded calf because the term originates from Samuel Maverick, a Texas rancher in the 19th century who notably did not brand his cattle. As a result, any unbranded calf found roaming was referred to as a "maverick," distinguishing it from those owned by other ranchers. The term has since evolved to represent someone who is independent-minded or nonconformist.
maverick
The baby is called a calf and mother is a cow. Together they are called a cow-calf pair, or "mom and baby."
It is still a calf if it has a mother or no mother. Maybe you could call it an abandoned calf.
"Maverick" usually refers to an unbranded calf or yearling.
A stray calf with no identifying symbol is typically referred to as a "maverick." This term is often used in the context of cattle that are unbranded or without any clear ownership markings.
Mother, dam or cow.
A newborn whale is called a calf. It will be called a calf until it is old enough to leave its mother.
A poddy calf is a not calf which eats the pod of peas. A poddy calf is an orphaned calf; one who has lost his or her mother.
Most often a calf's mother is referred to as the dam of the calf, or more commonly, a cow. If it's a heifer that has had a calf for the first time, some folks like to call her a first-calf heifer.
A cleanskin.
A group of whales is called a pod and a baby whale is called a calf. The mother is just called the mother.