I'm pretty sure everyone has one, I've noticed it in mine too. I don't think it has a name I think it's just your tongues shape. also, if you go take a look at "throat diagrams" in Google images, you'll see that it's even there in the picture unnamed! It comes right before the epiglottis go see for yourself:) nothing wrong with anyone's kids
I also have it too did u ever find out what it is??
Thanks
my friends nine year old daughter has exactly what you are describing, she has only just noticed it by sticking her tongue out in the mirror. if i find out what it is will post u