Lots of websites use mascots in their header, but my feeling is that mascots are not so frequent in logo design. This round-up presents some well designed logos that use a mascot.
1. Yeti snowboard club
2. Clowntale
3. Napoleon sushi bar
4. Grrrafix
5. Recipe Bot
6. Antartica
7. Brandoodle
8. iBox man
9. ClockingBird
10. Airomo
11. Tuna
12. Beast media
13. gatto picante
14. Ninjava
15. Monkey Business
16. Mariolle
17. Canina
18. Archery Center
19. Zoorganic
20. Moovies
Credits: https://www.designer-daily.com/wp-content/uploads/2011/02/napoleon-sushi-bar1.jpg