Could cranking amps????!!!Just be sure you have sufficient cold cranking amps and the battery is sealed to avoid corrosion problems. Bigger is not a problem if you don't overdo it too much.
Not from this battery, the engine is started form the traction battery, not the 12v battery. That is why a lawn mower battery will work. The 12v battery only operates the start up system electronics. The Prius is not "started", the Prius is turned on.