Fred, a firefox panda mascot I found for Pixelfed (pixelfed.org, inspired by artist Andy Cuccaro) panic on the back of a large whale smiling with headphones (https://funkwhale.audio/). These two are not official mascot, just approximation with random quick search. License: ??? (for Fred), my whale with headphones is an invention.
https://framapiaf.s3.framasoft.org/framapiaf/media_attachments/files/109/959/902/653/738/318/original/516c660f1825f2af.jpg