Check your terminology. Do you mean 3 phase (3 hot wires, a neutral wire, and a ground wire) power that would be used in a commercial building? If so, yes they are made. Most of the ones I've seen (I've only really looked on eBay) were large, expensive models designed so suppost an enormous load just long wnough for a generator to start. You can probably find ones designed for longer run times, though.
There has no 5-phase power supply available in the market.