What are the coloured pieces inside cupcakes called?
In comments, how you described what you're looking for is exactly what they are. It's dried fruit, usually candied or packed in syrup. Commonly seen in baked goods are dried candied cherries, candied pineapple, candied citron, currants and raisins. This Google Search will show you a lot of examples of fruit used like that. This Amazon page will show you the actual products the recipes ask for.