Do some qigong practitioners suck objects?

Abdominal pelvic suction is accomplished by atmospheric pressure. This is a skill.

There are two kinds of steel spoons: magic and special functions. Magic is also a skill.

Finally, talk about developing special functions through practicing Qigong. Qigong is the practice of controlling energy. It is feasible to directly act on the surrounding objects by controlling energy, but not everyone can practice it, which requires perseverance and skill.

As for whether it violates the laws of physics, please don't refer to physics textbooks. Please stand on the shoulders of Hawking and others and look at the universe.

Anything is possible.