I don't have the "DejaVu Sans Mono Regular" font variant
Me either
Also, my snowman is always in the uncolored variant
To copy into Geany, I had to "Edit" this issue description and copy/paste from there (and then cancel the edit). I think you also need a fallback font that provides it to be installed like [Noto Color Emoji](https://www.google.com/get/noto/help/emoji/).