DS (3yo ) made puff pastry circles spread with nutella and topped with thin slices of green apple. He also made apple and chocolate (melts but choc chips or another type would work fine) triangle parcels too. Yum!!! Can you see the trend Baked in 180 degree oven until pastry is puffed and golden brown.

You could have apple / strawberry / pear (or any combination of them) diced, cooked and cooled then placed on the pastry to make turnovers. There are lots of options with those ingredients