Place the Tajín seasoning onto a small, flat plate.
Rub the lime wedge around the rim of a margarita glass to moisten. Dip the rim into the Tajín until it is evenly coated.
Combine the frozen strawberries, vodka, lemonade concentrate, triple sec, and ice in a blender. Blend on high speed until the consistency is smooth and slushy.
Place the jalapeno slices at the bottom of each glass and gently press to release some of the spice. Pour the mixture into the prepared glasses
Slice a small slit into the bottom of 2 more fresh strawberries. Place the strawberry on the rim of the glass as a garnish and serve immediately.