I believe as Gordon does, that it is an amphibian who did this. Ive seen this foam in many plants here in the amazon region of Ecuador, Im sure there is a frog specie that does this in the Amazon.
That is a lot of foam. I wonder if it is an arboreal amphibian, such as a frog, that lays its eggs within the protection of foam to keep the eggs and young moist. There are a couple of species that do that in Africa and one, I believe, in Asia.
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