I agree with Tian -- there's no exact English word for this. I looked up the Chinese on Wiktionary, and the English translation they give there is simply "comments that scroll across the video screen." By the way, if you can access Wiktionary, it is often a good source for vocabulary like this. Here's the entry for your word: https://en.wiktionary.org/wiki/弹幕#Chinese

I don’t think there’s an exact translation. Perhaps you can call it bullet comments.

if you look for it with the separated characters, something like a bomb screen comes out