I did some research (I searched the Googles), and there was no front of card with Zuckuss or 4-LOM listed. One of "IG-88 and Boba Fett", but the other card is just the line up of bounty hunters. I couldn't find the back of the card though to see if it ran down the list on there. Anyone have the cards handy?

Wookieepedia:

In the fifth draft of Star Wars Episode V: The Empire Strikes Back, Zuckuss's name is misspelled as "Tuckuss" and he is described as a "Human-type" bounty hunter. This error was also carried over into the novelization.

If we're making typos "canon", what's REALLY his name? ;-)

4-LOM isn't in the novelization, and it sounds like he's not mentioned outside of the toys until 1989, where the Galaxy Guide add-on to the RPG gives the correct names for him and Zuckuss.

It seems to me that the only source for their names were the toys (which were incorrect even in 1985) until 1989, where the names were "corrected" from that point on.