Hey there! I'm not a native English speaker, so sorry for the question, but prone in that context means lying on the ground, but in general still able to act with disadvantages?
Viewing post in Isle of Lore 2: Status Icons comments
I will make such an icon on Monday for you and post it here. I'm not that familiar with Roll20, but is it possible that you add such a single graphic then by yourself to your Roll20 tokens? Because until I come around to update the whole pack (with the icon), it will take a bit of time (mostly because I'm in the progressing of setting setup a new exporting routine for my assets, which isn't 100% done)!
Yes, I purchased the tokens here and manage my own pack on Roll20 using the Custom Token Markers.
Here you go!
https://stevencolling.com/projects/asset_packs/iol2_status_icons/downloads/status_icons_extra_0.zip
I hope that's what you were looking for! :)