for example the ocelot '1' card has the passive which allows you to roll the die which adds to the total value of the '1' ocelot card.
let's say i roll a '2' on the die, giving me a total of value 3 for this starting ocelot card.
can this ocelot card '1' be used ALONE to build the 3rd stall?
For sure, yes on this one.
there is also a another ocelot '5' card which has a technique allowing you to add a value between 1-5 to the '5' card as long as the opponent guesses incorrectly. let's say the opponent did guess incorrectly, can this single '5' card be used to build the 8th stall?
I'm 99% sure it's a yes on this one...but I can't picture the card off the top of my head, so I don't want to give you bad info. But I'd definitely lean toward yes...especially if it's in the same vein as your first example.