I'm pretty sure they are Calamansi/Kalamansi/Calamondin. They're perfect for everything—lemonade, winemaking, sauces, and sour dishes. Or just a mixture of Calamansi and soy sauce with chili slices, including the calamansi skin—mixed as a dip for fried fish or roast pork! Gosh, yum!
The leaves can be used for tea and as a hair conditioner.
You can also rub the fruit on nails to whiten them.
Some use it as deodorant. Haha.
The weather there is similar to the Philippines, so I bet they are Calamansi.