1 peso Philippines

What do u mean by frosted?

I don't like to reply with videos, but this video shows an example of frosted vs non-frosted with high grade coins. (I didn't listen to the audio of the video at all.)

https://www.youtube.com/watch?app=desktop&v=RIW9oQMrKeM 

Some coins frost the design, others frost the background or the entire surface. Frosted is easy to see when comparing high grade coins, but it becomes harder to distinguish as coins become worn.

Personally I can't believe that these "frostings" (areas that are not shiny due to a rougher die texture but look like hoarfrost especially on a proof coin) are deliberate. 

They are standard circulation coins made in the multi-millions. I think they just don't polish the dies completely so you get the portrait part a bit more worn similar to the sandblasted specially treated coins for certain proofs.