Whisk together the sweetened condensed milk, half & half, lime juice, lime zest, and salt in a bowl and whisk until thoroughly combined. It will thicken slightly - a reaction between the lime juice and milk - I love that.
If using ice pop molds, fill them almost to the top and pop in their sticks. If using shot glasses, fill them almost full, then cover with plastic wrap and stick popsicle sticks through the wrap (which will hold them in place) - the mixture is likely thick enough to hold a stick upright without the wrap, though. Freeze until solid.
Spread the crumbs on a large plate.
Unmold the pops and dip into the graham crackers, coating as much as you like.