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Building and Carpentry

Why is a frog in a brick called a frog?


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November 18, 2009 3:52AM

The reason for the recess in the surface of frogged bricks being called a frog is not known.


One theory is that as the block used to press this indentation is also called a frog, possibly based on the appearance of this block especially if some clay adheres to it, and the name was transferred to the recess created in the brick by the frog.


Another theory is that the similarity between the recess in a brick to the recess under a horse's hoof is the origin of the name "Frog".

The compacted mud that drops out of a horse's hoof can look like a crouching frog or toad.