the offspring of an otter is called a whelp
whelp
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Otters
sea otters usually have one single offspring in one cycle.
how are otters and mice alike
The name of an otters home is a "holt."
lutra lutra
the name of a rabbit's offspring is jumbalia
sprin
The offspring of a snail does not have a specific name. They are simply referred to as baby snails or snail offspring.
Ferrets have been mated with mink, wild European polecats (ferrets) and ermine, and have been surrogates for black footed ferrets, and are related to otters, but I don't think that mating with an otter would be successful.
Otters.
The name of an offspring depends on the stage within the life cycle you are referring. Offspring are either called larva or ant.