Yeah, Google tells me there are several American species called that with their common name, and people chewed on some bits of them because they numb the gums and mouth and help toothaches. They have these spiny spikes on their trunks so the cover does seem to show one of it.

There apparently also is some attraction in Kathmandu with that name where you can ask a holy tree stump for divine intervention against your toothache by nailing a coin to it.