is there a source for these and if so how are they licensed? We would love to use them on some messengers as stickers, if that's okay?

@riversoflight I'm still working on them,, but once they're done they will appear here under CC BY-NC-SA 4.0: volpeon.ink/emojis/

are the others that appear there also yours and if so are they okay to use?

@riversoflight Yep, I made them all. ​​ They mostly use the same license (it's indicated when you navigate to an emoji pack)