I am not sure, because it is always difficult to judge from a picture.
I do not think your green beads are treated glass, but treated stone. A lot of stones get treated or dyed along the way. I think that is what has been done to these stone beads too.

About the glass being wood. It looks like wood to me. If you touch it, and it is cold and heavy, then it is either glass or stone. If it is warmer and light, then it probably is wood.