So i'm on the other side of this, as I teach English online, mainly to little kids, and I have a stutter. I did work on Cambly a while back, and with Cambly, you can put in your profile that you have a stutter, and message any teachers you book with, before any lessons you have. I can't speak for other online teachers, but I know that even if I didn't have a stutter, teaching someone with a stutter wouldn't bother me. And it would be nice to have a student like you, that actually wants to study English, because that can be hard to find on Cambly. Don't be discouraged, and go for it!