Another one of those (almost) famous breads that forms part of the bread offerings from large commercial bakeshops to small neighbourhood bakeries.
Teren-teren is made up of small pieces of filled buns then glazed with butter and topped with sugar.
Being called as such probably stemmed from the loose local dialect term that refers to anything that is being connected or in a line and moving as one, be it a group of kids or line of cars, but this instance, bread.