...The problem with the Red Cross knives is that the knife and spoon do not separate, so they cannot be used at the same time. Many US cutlery firms made them for the Red Cross in 1917 and 1918. They were never made commercially, because no consumer would spend his own money to buy one to use. They were considered a joke in the industry at the time, but nobody complained, because the industry had orders for around a million of them, paid for by public donations to the Red Cross, while the US military was not buying pocketknives for soldiers or marines, only for Navy seamen.
A "Hobo" knife was originally (in the 1930s) a sheath knife with interchangeable blades (for hunting, fishing, and eating). But these are very rare, so collectors in recent years mistakenly applied the term to take-apart knife-fork and knife-fork-spoon folders, and the name seems to have stuck. The old name for these was "slot knives," because of the tab-and-slot arrangement that holds the parts together. Folding knife-fork(-spoon) sets that do not slot together were sometimes called canteen kits. But they were not called "hoboes" until recent years.
BRL...