Hi Sherjack,
Last summer my toddler's swimming pool was left outside for a few rainy weeks. We had a hundred or more tadpoles hatch! I would assume that what you have are tadpoles too. You can watch them and see how they develop.
Here's a good link for getting more info about tadpoles:
http://allaboutfrogs.org/info/tadpoles/
Take care!
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