I studied probability theory in graduate school about 50 years ago, but I still use it for risk management assessments and stochastic simulation work. Not often, but enough to keep my understanding current.
Odds are a way that gamblers describe a bet. They are generally based on probabilities but include a margin for the house. For example in US roulette the odds on a single number bet are 35 to 1. $1 bet wins $35. However, there are 38 numbers so the probability of winning is 1/38 and the expected value of that $1 bet is 36/38 or a bit less than $.95. (Its 36 not 35 because you get to keep your original bet.)
In the Scratch Card Totem said:
What you can win
10 credits
50 credits
100 credits
A free card
One of the special event cards
They said nothing about the probability of each winning outcome. I don't think anyone expected that the probability of winning 100 credits would be the same as the probability of winning 10 credits. Since the special event card is probably the most valuable win, I would expect the probability of that is lower than the others.
In most gambling situations it is possible to calculate in advance the probability of winning a fair game based on the structure of the game. In the US, baseball fans calculate and memorize the probability of every player getting on base based on their past performance. In most (all?) US states lottery games must publish the odds of winning to save the players the work of doing the calculation themselves.
There is nothing that requires Totem to publish the odds of their games, but it would be a good idea if they did that in the future.