Maybe (similar to how ppl tricked Far Cry, etc., to think it was running on an ATI instead of an NV card, and vice versa), but why? You're probably going to get errors when running it if it tries to do something your card can't.
I don't know how to change the card name a program sees, BTW, but maybe someone else who checks in this thread will.
But, yeah, a GF3 or similar card has got to be $20 or less by now.
Edit: Ah, a laptop. No luck there in terms of upgrading one with an IGP. What IGP (integrated graphics processor) do you have and what game are you trying to trick?