Google and redirect urls

Hi,

I have a client who's bought a bunch of domain names (which I'm changing in this text for privacy reasons) . He wants to change the domain of his business from Johnscreams to IceCreamJohn, his logic is that people searching for 'ice cream' are more likely to find him.

Is there any way to keep his domain as Johnscreams, but also link the domains in some way so that he appears under IceCreamJohn for the SEO boost?

Cheers.