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31 May 2015 Last updated at 10:29 BST
The young crocs are a protected species and are classed as critically endangered.
The 12 crocodiles had been in quarantine to keep them from getting diseases.
Experts said the creatures were healthy and strong enough to live in the wild.
Martin has this report...
Rare baby crocodiles, that were donated by a zoo in Sweden to Cuba, have been released into the wild.