There are definitely bots in frontlines. At least yesterday while I was playing I noticed quite a few people (probably about half or so of the alliance) doing some really janky movements. They would all stop facing the same direction, and would move all in unison a second or two later. I only noticed it once or twice in the match, so its not super apparent otherwise. That being said, the games I have played with Bots generally go better then the games I play with real people unfortunately.