forest fruits, "bosvruchten" is a word used for berries that you might find in woody areas (no, not those woody areas...) like blackberries, raspberries, blueberries and small strawberries.
They use the name forest fruits to give it the idea of something romantic and wholesome I guess. Imagining people picking these fruits happily in the wild, and then making your dessert. But of course, all the fruits come from farms. Still tastes good though.