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The diet consists mostly of arthropods ( in particular grasshoppers and crickets ) , but also vertebrate remains ( other frogs including " Physalaemus crombiei " and " Scinax argyreornatus " as well as unidentified bird feathers ) can be found in their stomach contents .
 Physalaemus crombiei, Scinax argyreornatus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 Physalaemus crombiei, Scinax argyreornatus