Gecko stones are interlocking tiles which can be used to cover a plane area without gaps or overlaps.
Tessellation of stones occurs when geometric patterns interlock and come together as a pathway or other flat surface. One unique shape of tessellated stone pavers resembles that of a gecko.
Day gecko, leopard gecko and crested gecko
One common use is in tiling.
Gecko
The most common type of house pet of the gecko is the leopard gecko and other geckos
One common use is tiles in a bathroom.
Tiled bathrooms and paved areas are common example.
Yes it is a tessellation.
Non-visible tessellation or non-existent tessellation, perhaps.
Rare
I does if you want it to! =D
How to Make a Tessellation?