Female goats are referred to as does or nannies, intact males as bucks or billies; their offspring are kids. (Many goat breeders prefer the terms "buck" and "doe" to "billy" and "nanny"). Castrated males are wethers.
Frogs call their young tadpolls.
nanny Doe.
young trout
A chick
infant
Alligators cannot speak, but humans call young alligators "hatchlings".
Young elephant.
No Usher does not call Justin Bieber young phenomenal.
Young fish are called fry.
A young elk is called a calf
A young lion is named a cub.
A young warthog is called a piglet.