Yep. Whether Poa Annua or another bluegrass that is typical this time of year. It is having a banner year due to the longer winter and cool spring. It likes cool and damp and if it is the Poa Annua then heat kills it off. Don't water until you must and wait for the heat. A pre-emergent for crabgrass control in fall and early spring next season will knock it way back but those seeeds last years and nothing kills it that doesn't kill your turf as well. Also, next year if it starts popping up weeks before your lawn turn you can add vinegar to a pump sprayer and spray it and every 'early' weed before your grass greens up early in the day then the sun/acid will burn it right up before it spreads and goes to seed. What kind of (intentional) lawn do you have? Once the soil warms to around 70, especially if fairly dry and not shaded, this stuff dies out.

For comparison, this is Glechoma hederacea growing at my house. 100% guarantee the ID of these pictures - I am an herbalist and do harvest this for herbal purposes. I tried to take a picture of a "patch" that was of similar character with close-ups for the OP to compare to. I do not see the "round objects" in the original photo but Glechoma hederacea do get galls in its stems that are very round. FataMorgana

Yeah looks like Triv, which is tougher to remove. Where did you get your seed? Was it a sun shade mix? I read on another forum that Poa Triv is added for shade tolerance in some big box store brands. Tenacity will whiten Poa Triv but not kill easily, I don't think. Is that all you have? If yes dig it up with weed removal tool and get every last bit of root. if you have turf type tall fescue do not use Certainty , you may need Velocity which recently became available for residential use.

I have not seen Quack Grass developing seed heads this early in the year but I have seen Johnson Grass do that and that looks more like Johnson Grass than Quack Grass to me. Both spread by rhizomes so all of the roots system needs to be removed to eliminate it. Of course one really good way to know what it is would be to take a sample to your local office of the Penn State Cooperative Extension Service. kimmq is kimmsr