yes it is possible to get it in your mouth my mum did years ago you should get it checked.
Be checked for Candida... it's yeast in your body but, it can cause all sorts of stuff.
Sounds like Thrush...they have a mouthwash for that.. Go to the doctor and have your ears checked to, it likes to lurk in dark damp places.. You have to treat it right or it will come back..
Typically, thrush in the mouth can be a very painful thing. Do you have any ulcers at all that have a white coating on them?
yes i do have some canker sores in my mouth about five or them but this is typically normal for me to have an outbreak of canker sores . . . this has happened ever since i was very young but i've never had a white coating on my tongue before. My tongue doesn't hurt the canker sores cause a little irritation.
I brushed mt tongue with Baken Soda tooth past which it removed 95% of but since funges grows fast you have to keep brushing daily with baked Soda.