What is a grotesque carved head that catches rainwater called?

Answer 1

Gargoyle Rain Spouts or Roof Scuppers

Gargoyle has been defined as a water spout which projects from a roof gutter and is designed to drain or throw the rain water away from the walls of a building. Gargoyle water spouts or rain spouts preceded downspouts which drain water from rain gutters into a drain down pipe or downspout and have a horizontal downspout extension at the bottom end of the downspout that carries the rain water away from the foundation. The word gargoyle comes from the French word gargouille which means throat in English. The words gargle and gurgle also come from the same roots as gargoyle. Gargoyle was also derived from the Latin word gurgulio which means both throat and gurgling, which is the sound of water passing through a gargoyle rain water spout. Gargoyles have been around over 4000 years dating back to ancient Greece, Rome and Egypt. Water spouts in the likeness of eagles, lions and other creatures, some mythological, were very common. Water spouts then began to resemble grotesque or monstrous creatures and were often positioned at each corner of the rooftop.