They might be quinces,but really we need to see a photograph showing the leaves and growth habit of the plant you picked them from

Did they come from a tree or a shrub? If the latter it would have had large white or pink flowers in early spring. Cut one in half. If its seedy central part takes up a lot of the fruit and there's quite a strong acidy smell it should be edible but they are very strongly flavoured and one or two are enough to flavour an apple pie.
Google Chaenomeles fruit to compare.