Pervasive plant in yard
The leaves in the photo are probably those of the white trout lily Erythronium albidum or a closely related species. Go here to learn more about it:
Most people consider the white trout lily a delightful spring wildflower so there are no control recommendations. However, it's likely that commonly used broad- leafed lawn weed killers will eliminate it.
Although trout lilies often grow in dense colonies, flowers do not appear until individual plants are several years old.