Blend strawberries, mango, banana, lemon juice, Greek yogurt, honey, and vanilla until smooth and creamy. Taste the mixture before freezing so you can adjust sweetness if needed.
Stir in chia seeds or extra fruit pieces if you want more texture in the finished popsicles. Pour the mixture carefully into popsicle molds, leaving a small gap at the top for expansion.
Insert popsicle sticks and place the molds on a flat freezer shelf. Freeze for at least 6 hours or overnight until completely firm and easy to remove.
Run warm water over the outside of the molds for a few seconds before removing the popsicles. Pull gently upward and serve immediately for the best texture and appearance.