hard to tell from your pictures if they are small cracks or something poked small iholes in dash.
If the hole is cracked all the way around,then I would remove that tiny piece.
No need for filling with foam on these small ones, foam only for deep wide open cracks.
I would tape off the good surrounding areas around each one or group since you will want to keep as much of the good dash texture as you can.
Sand the area in question for something for the filler to bite into. Clean area well and apply thin layer of filer and let it set up. Sand until it is about level or close to being about right.
Then remove the tape and do the final feather edge sanding.