Origin of spade foot
Examples from the Web for spade foot
I found on investigation that the water was moving with spade-foot toads.
The water was almost jellied with their spawn, and a little later was swarming with spade-foot tadpoles.
The one on the left has the Prince's feathers, and all of them show the slender leg which in two of them ends in the spade-foot.The Old Furniture Book|N. Hudson Moore
The legs were generally much more slender than the Chippendale and often ended in what is known as a spade-foot.Remodeled Farmhouses|Mary H. Northend