Are there metallic foams?

Question

For what purposes metallic foams are used?

Answer 1

Yes, there are metallic foams.

Aluminum is commonly made into a foam.  It's denser than polymer foams (and much denser than aerogel), but it's also much stronger and has very good energy-absorbing properties.  It has applications in ballistics for this reason.

The lattice structure of a metal foam gives it a lower density than solid metal, but due to the vastly increased surface area, it is much more susceptible to corrosion, making it unsuitable for many structural applications.

Answer 2

There is super foam and supra foam where the geometric  structure is amplified when subjected to magnetic wave.Such as metalic hydrogen.