It’s refering to a defunct games company: https://en.m.wikipedia.org/wiki/List_of_Bullfrog_Productions_games
I’m very familiar with Bullfrog. Loved a lot of their games.
I hate the trend of gaming journalists using “-like” to describe genres of games
We call them first-person shooters now. And I think they were usually called Doom-clones. But it makes sense that they’d use a word like that when a word for the genre hadn’t really been codified by that point.