Do foaming soaps use unnessesarily more water than less soap?

No. Foaming soaps do not use unnecessarily more water than regular soap. In fact, they can actually help you save water. That's because foaming soaps create more lather with less water, so you don't need to use as much of it to get the job done. Additionally, foaming soaps are often more concentrated than regular soap, so you don't need to use as much of it per wash.