Can i have a canker sore on my tongue? i've got a sore on the underside of my tongue that kind of looks and feels like a canker sore, but i've only had them on the side of my mouth. can this be a canker sore?

Yes, : Yes, this is possible and one of the common locations for a canker sore. Feel free to read more about other dermatologic conditions at the link below. Good luck.

Yes possible: It is possible. Canker sores can appear anywhere in the mouth. They are very common under the tongue. If it is not gone in a 2 week period, i would recommend having it checked by a dentist.