The phrase "artificial rocks" is correct and usable in written English.
It can be used to describe rocks that are man-made or synthetic, often used in landscaping, aquariums, or construction.
Example: "The garden was beautifully designed with artificial rocks that mimicked the appearance of natural stone."
Alternatives: "synthetic rocks" or "man-made rocks".
In all the rooms, speakers hidden in artificial rocks broadcast the sounds of frogs and birds.
The crystalline rooftops of the indoor pools sparkle in the afternoon sun; swimmers frolick in fountains and are pummelled by waterfalls tumbling from artificial rocks.
As Erik held the rope, Nesbø climbed the wall; its colorful artificial rocks, or holds, looked like large clumps of Play-Doh stuck on by children.
"Because of height limitations, no one's building the old monkey bars anymore, but kids can go up smaller climbing walls and rope nets and artificial rocks".
Climbers scaled routes, or problems, on artificial rocks that were brought in for the event, but several real boulders in the park can be climbed for recreation.
A recent overnight visit revealed that there is apparently no shortage of people who prefer nothing more than to while away the wee hours testing hiking boots on artificial rocks or fishing for trout in an indoor pond.
An artificial rock-climbing wall covered one side of the glass-and-steel research center.
It was a summer series of derring-do off poly-wheel skateboards and artificial rock walls.
He sucks on his right hand, then cleans the toes on his right foot, which rests on an artificial rock.
There they find, atop an artificial rock formation, the flags of the Army, Navy, Air Force, Marines and Coast Guard flapping in the Florida breeze.
Several feet away, a more bare-skinned group of people has converged near an artificial rock wall.
