Maybe, but not recommended.
Laptops rarely have any overclocking capability. The space for cooling is very limited. It works in DESKTOPS because a much larger cooler can be added.
If overclocking was possible it would say so in your BIOS (F2 or DEL on bootup), but I doubt it will.
*I have heard of people using a tool called AMD OVERDRIVE, though the laptop would have to support that. Keep in mind if your fan isn't up to the cooling task your system will just crash.
No idea if this would work:http://sites.amd.com/us/game/downloads/amd-overdrive/Pages/overview.aspx
I noticed your description says up to 3.5GHz already? That probably means when only a SINGLE CORE is needed. Due to cooling requirements, modern CPU's can increase the frequency to a single core if the others are NOT used. Chances are that in a game it will NOT help.
So I'm pretty sure your laptop isn't intended to go beyond the rated specs.