Roughly speaking for now there is no way to know the altcoin or token you got/buy from the project is a scam, except: You check all the origins of the project in detail before you make a decision to join or buy tokens to become an investor, it's a long process.

Suggestion:
If you want to get altcoins/tokens from projects/bounties, at least you can see the manager who manages the bounty who has a good reputation or not in this forum, at least it can have a good chance of tokens/Altcoins in the market and also the team involved in the project.

With advice like that at least, you are a bit spared from Altcoins / tokens that lead to scams, because managers who have a good reputation will assess the Altcoins/tokens/teams involved in the project carefully, before they make a decision to promote the project in this forum.

Note:
What I tell you does not guarantee 100% that you will avoid scams, sometimes managers can also be tricked by the company after they successfully promote their project, but good reputation managers at least they do Escrow, for guarantee.

Did the team tell you that the token will give you 100x return? If so, that is already a red flag on its own. I would completely avoid it or just spend 1% of my portfolio if I feel like gambling on new or micro cap projects.

As long as you add more information about the project you mentioned, people here will help you, but I have these thoughts aboutdo you understand it?
do you have faith in it?
....
There are a lot of factors that I'm sure you don't really understand, so for a newbie, I think they need time and money to experience new things, advice is considered superfluous because most new entrants don't like to listen to the opinions of their predecessors.

Although this was posted almost a year now, I think you can still learn some of the fundamentals and parameters to assess if the token will turn out to be a scam or not. It's a compilation of guides that you can read and it may take you a while to learn the patterns of what a scam project does.

Collection of comprehensive guides on identify and avoid scam projects

Just a heads up, even if the project has something nice to offer to the public, it doesn't mean that they will be always truthful to their investors all the time especially now where the market has turned upside down. I would rather use them to "degen trade" instead of falling in love with these altcoins that pop out of thin air during the bullish season.

First answer yourself what makes you feel why they are scam. Maybe the answer is obvious.
Check their team and previous experience. If they are new or no-names, I would start to be suspicious. How can a developer has nothing do display on public and promise success?
Check what they offer or are developing? Is this something new? Or another swap/exchange/dog (or other animal) related project? There are thousands of them already. They cant make 100x.
Think about benefits they offer for investors. Isnt it sounds to sweet? Remember, there are no easy and quick money in cryptocurrency, at least anymore.