They’re not Crocuses. The foliage looks different and besides it would be long gone by this time of year. I can’t id the ‘grass’ except to say it looks more like a sedge.

Here is another photo of the small ones, they are coming up in different spots. Does the sedum grow from seed and/or runners? Wondering if it is the same as the large one.

Sedge, not Sedum. Some Sedges do have runners. But I am not saying this is definitely a Sedge. However, it is definitely not a Crocus.