This is the Tentacle Series of planet sculpting tools.
The Tentacle Hills sculpts Tentacle themed hills.
The Tentacle Mouth Hole sculpts Tentacle themed craters.
The Tentacle River sculpts Tentacle themed rivers.
The Tentacle Canyon sculpts Tentacle themed canyons.
The Tentacle Plateau sculpts Tentacle themed plateaus.
The Tentacle Suckers sculpts Tentacle themed mesas.
The Tentacle Mountains sculpts Tentacle themed mountains.
The Tentacle Arm sculpts Tentacle themed lava flows.
The Tentacle Seas sculpts Tentacle themed seas.
These are found the same way as artifacts: by visiting a planet with yellow radar waves coming out of it, using the radar to locate the item, and then using your Abduction Beam to acquire it. They have the same appearance as terracoloring tools, so you can't be sure what you will get.