"fig 6: Monkey Wrench and Pipe Wrench" - some plumbing website
The thing on the top is an adjustable wrench. The adjustable wrench is the successor to the monkey wrench.
The second picture is a monkey wrench.
Pipe wrenches have angled teeth to that give more traction when turning a pipe. Using a pipe wrench on a nut messes the nut up. Monkey wrenches have flat teeth that fit around a hex nut.
Therefore, the Blockland wrench is a monkey wrench. Unless you conclude that pipes in Blockland are shaped like hexagons as well (which they probably would), in which case a monkey wrench and a pipe wrench in the Blockland universe would look exactly the same.