This is my first project using frosted acrylic and it turned out really well.
This materiel is 3mm frosted black perspex acrylic and it is now my favourite acrylic for engraving.
The matte surface engraves really well and gives a really nice contrast between the black background and light grey engraving.
I'd recommend doing some tests first to find the settings that work best with your laser.
This frosted acrylic cuts better than most other acrylics I've tried and the engraving stands out really nice on the matte background.
These are the settings I used with the 5w D1 laser.
I would recommend using the materiel test array feature to find the best settings for your laser.