Nope, they're locked CPUs. Also, depending on the laptop it's sitting in, they're often thermally constrained anyway. What I mean by that is many ultrabooks that sports those "U" processors are not actually able to handle the 15W thermal load those CPU can generate for a sustained period of time. If you have bursts of performance the cooling solution can handle it, but run it at max load for a period of time and the cooling solution gets overwhelmed, temperatures hit a predetermined maximum, and then the CPU throttles itself down to keep the temperature under control.
Because of that, you don't want to overclock it even if you could, it would just reach that threshold even quicker and have to clock down, resulting in really inconsistent performance.
The only thing you can do is keep the laptop as cool as you can. Make sure all the vents are clear of dust. Find where the chassis gets hot and make sure it has as much airflow as possible. Sometimes propping the laptop up on something helps. You could even point a fan at it. Try and direct air over the hottest part of the chassis. There are even "laptop coolers", which essentially do that in a slightly more compact way.
In reality though, unless your laptop is seriously overheating and clocking down in a big way, you're looking at maybe 10-20% performance bump at best, which isn't going to be game changing for your 20fps lows.
I assume you can't lower settings any further? Can you drop the resolution?
The main problem is that you're trying to game on an ultrabook processor - which is designed to provide just enough performance for basic office tasks and maximise battery life. It's really not designed for what you're trying to do.
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