Google doesn't hire front end software engineers specifically. They hire general-purpose leetcoding machines (e.g, people that can can crank out DP problems), then assign those people to work on front end tasks.
For a data point, when I applied and interviewed for a frontend-focused position at Google ~1 year ago, I had the option of one of my interviews being a front-end specific interview that would focus on FE rather than algorithms.
That interview track contains the DP-type problems. So now, not only do you have to show your DS&A algorithms skills, you need to showcase your front-end skills. If you interview as a backend engineer, you'll get more algorithmic questions, but overall question set will cover less breath and a similar level of depth.
I interviewed a couple of years ago at Lyft (for a backend team) and definitely got FAANG-class systems whiteboard questions.