Hello, I wanted to ask if you can use a normal mountain bike to jump on smaller trails even though it doesn't have full suspension?

Whether full suspension or not, has nothing to say for the stability of the bike.

But it depends on what it is basically designed for. If it is a bike designed from the outset for a rabiate gear type, you can also make jumps with a hardtail. And if the Fully is designed as a lightweight racer, you need to know what you do in heavy terrain as well as with a light hardtail.

And the question is always: what kind of jumps. If you can make a clean, gentle landing on a beautiful ramp, amazingly high jumps go without the bike being particularly heavily loaded. In contrast, a bad landing on uneven ground can be too much even with a knee-high jump. And a 100 kg guy is of course always a harder load sample for the bike than a 50 kg boy.

If your hardtail is one of the spread 500-1000 € models with 100 mm feather fork, it is most likely not intended to jump higher than knee high. You should bear this in the interest of your own health.

If you are concerned with warranty claims in case of damage, you should also look into the user manual. The manufacturers provide information on how difficult the bicycle can be loaded. If you jump higher or the like, the warranty expires.