Hoodoos in southern Utah

According to Miriam Webster Dictionary.com Hoodoo is

a natural column of rock in western North America often in fantastic form

Fantastic for sure!

Hoodoos are such a fun name for these awesome rock formations that are formed by nature, especially rain and ice.

According the a US Park Service Benchmark (plaque) on the Navajo Loop Trail

Water and ice are the sculptors of Bryce Canyon's wonderland. Melting snow and torrential rain erode the softer stone and carry it downhill, leaving behind massive slabs of standing rock. Ice cracks this rock apart as it freezes and thaws, weathering it into fins and hoodoos that spark curiosity and imagination.

They are all different sizes and shapes.

According to the National Park Service Website

There are multiple types of rocks that make up Bryce Canyon. All of the rocks contain abundant calcium carbonate (CaCO3), a mineral that dissolves when it comes into contact with even slightly acidic water. When it rains at Bryce Canyon, the (slightly) acidic rain is enough to dissolve the calcium carbonate that holds these rocks together and allows them to erode into their current shape (and continues to shape them).