At the back of my tongue I found a lot of bumps at the back of my tongue. They are pink and raised and when I scratched at them I discovered they were attached to my tongue, in a mushroom sort of fashion. I don't feel sick and the bumps don't hurt at all.
I only noticed them after I stuck my tongue out after eating a slushie, but I eat slushies (and candy) a lot and this has never happened before.
I've never had sex or had any sort of sexual contact, so I don't think it's an STD.
I'm really freaking out though.
The bumps you may be seeing in the back (posterior) part of the tongue may just be tongue papillae (taste buds). The ones which are in the back of the tongue are called circumvallate papillae.
If you are still unsure and worried I would suggest contacting your dentist. :)