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There is something mildy infuriating about Discord putting Tux behind a paywall.
(piefed.chrisco.me)
A community for everything relating to the GNU/Linux operating system (except the memes!)
Also, check out:
Original icon base courtesy of lewing@isc.tamu.edu and The GIMP
Discord pays for their own infrastructure, so their "Nitro" subscription pays for additional features, which off the top of my head include:
The "Linux" emoji, as the other person said, is likely from a different community ("server")
If you create your own server you can add whatever image you want as custom emoji/sticker. Someone probably uploaded an image of Tux as a custom emoji for their community