What term refers to a young-of-the-year elk or young-of-the-year moose?

The term "calf" specifically denotes the young-of-the-year elk or moose. This terminology is consistent across various species of large mammals; for instance, a young cow (female) moose or elk is referred to as a calf during its first year after birth. This term emphasizes the developmental stage of these animals and is often used in both veterinary contexts and wildlife management.

In contrast, the other terms have distinct meanings that do not apply to elk or moose. "Doe" is used to describe a female deer, particularly in species such as whitetail or mule deer, and is not applicable to elk or moose. "Fawn" typically refers to a young deer, specifically those under a year old as well, but it is only used for deer species. "Lamb" describes a young sheep, and is unrelated to both elk and moose. Hence, the use of "calf" is the precise term for referring to the young of these large herbivores.