I guess it’s possible that he or she might be eating the fruit, but most aquatic turtles primarily eat bugs, worms, small fish, snails, crawdads - high protein things. They will and do eat some greenery, but it’s not usually the main go-to. I have a tank in the house with hatchling red-eared sliders, and occasionally I would bring home a leaf or two of red leaf or green leaf lettuce and they take to it fairly quickly as well.
Almost all turtle hatchlings that are aquatic survive, almost entirely on snails until they get about Silverdollar sized, as the calcium from the snails helps, build their carapace (shell).
Not sure if you have crawdads and snails snd the like in your pond, but those definitely will sustain a turtle, along with bugs that fall into it.
Scooter