"At least in Germany this stuff is called "3-Schichtplatte" (three layer board) and is actually quite common. You can get it in every home improvement center, the wood species is usually spruce or fir. "

"Actually, "Spanbaum" doesn't translate to "spanning tree". The german word "Span" describes a sliver or a chip. So it's better called a sliver tree or maybe woodchip tree."