These are the eggs of a tree frog from the genus Eleutherodactylus. Based on the calls I heard in the area where I found them, I believe it is the Martinique Robber Frog. At any rate, this genus of frogs has been highly successful in colonizing the islands of the Caribbean (something that is generally difficult for frogs to do). One of the probable reasons for their success is that they go through the tadpole stage of development within the egg. That means the eggs hatch into tiny froglets, and these species don’t need standing water to complete their life cycle. In the photos, you can see the tiny frogs developing inside their eggs.
