Unsure what these are so have placed them under Fungi for now. They appeared overnight after rain. The images show inconsistent shapes and sizes, as well as cracks, dents and tears in the outer surface of some of them. One image shows the inside, which has a light yellowish colour. The images also show that they appeared on top of leaves, beneath leaves and on the edge of leaves, so possibly a fungal fruit body rather than eggs of some sort? They are still in the same location days later and are now a dark brown colour.