I just found the same thing on the back of my tongue. It felt like a popcorn husk stuck on the back of my tongue and when I looked I found the bumps. Just like you, a couple on one side and about twice as many on the other. No pain, they don't look ulcerated, just bumps. Also, like you, when I researched on the internet, it just scares you what you find. I'd love to hear what you found out about your's and if they have cleared up.
they could be circumvallate pappillae, which is normal anatomy. i'd see a dentist to have it checked.
They do not sound like something serious. It sounds somewhat like normal anatomy. To be sure, have your dentist or an oral surgeon take a look.