I'm guessing you're operating on the misunderstanding that salt water REPLACES chlorine. This idea has been promoted by some unscrupulous pool salesmen and companies. In fact, salt water systems are Salt Water Chlorine Generators (SWCG) and are merely a METHOD of introducing chlorine into the pool.

If you mean, can you use an SWCG on an uncirculated kiddie pool, the answer is, "No!".

But you can use them on a pool like this:
12 foot Intex pool @ Amazon
The SWCG is a separate unit, like this:
Intex SWCG + filter @ Amazon