Using the quick search there are shown up to three reports about frog embryos:
Red-eyed treefrogs, Agalychnis callidryas, lay jelly-covered egg clutches on leaves overhanging tropical ponds. Each clutch of several dozen transparent eggs is ready to hatch after only four days. By...
Biowissenschaften Chemie |Using the fulltext-search for the word frog embryos you can set up serveral searching-options > choose search options