It is questionable whether this is rock slab is really from a coprolite. It is an interesting rock nevertheless. Can you see the shape of a white bear wearing a red scarf? The bear appears to be looking off to the right side. Seeing images in rocks, clouds or even toast is a phenomenon known as pareidoilia.
Many rocks are sold online are said to be coprolites. These rocks are primarily made up of silica (aka siliceous). However, without identifiable inclusions or backfilled burrows left by coprophagous (poop-eating) insects such as dung beetles, it is impossible to determine if these are geological or really do have fecal origins.