They have a Donut of the Day with Dulce de Leche. Their Donut of the Day rotates, so you may have to stop by frequently to catch it.
The donuts are plain but delicious! The toppings add everything - not sure if they have dulche. The have donuts of the day which are sometimes other than plain. Definitely give them a try!
I have only been to Glazed Over Donuts once, but I only saw the glazed donuts flavor. As for the ice cream flavors, only vanilla and chocolate. If more of us Latin Americans visit this place, maybe they shall add a dulce de leche flavor.
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