They do, it's r/comics. I post my comics to Reddit on r/comics and r/funny most frequently - if one of my comics contains themes that can also apply to a different subreddit (e.g. r/gaming), I'll post there as well.
A few pointers for people who want to post to Reddit but aren't too familiar with the site:
- r/funny does not allow you to create a thread until your account has been around for a while. I learned this because I made a new account specifically for my content and my first couple submissions were removed for this reason. I don't know how old your account needs to be, but wait a while (maybe a month) before trying to post your stuff there
- Read the rules of the subreddit you're submitting to - you don't want to keep getting your posts removed because something about your submission violated the rules
- You WILL get downvoted - even more so, you will never know why because most people don't leave comments. Maybe they had a good reason to, maybe they didn't, you won't know. Whatever you do, DO NOT call attention to your downvotes or complain about them, this will only invite more.
That's all I can come up with so far. Feel free to ask about anything else and I'll answer what I can.