Frogs have ridges of some thing called the maxillary teeth, that are tiny cone shape around the top jawline and even in many instances what is called Vomerine Teeth at the roof of the mouth. The frogs use their version of so called teeth to hold their catch inside the mouth until it is swallowed. However as the definition of teeth goes frogs do not have any teeth at all.
There is no scientific distinction between "frogs" and "toads," although most anurans are usually referred to as one or the other. Anurans have several synapomorphies that distinguish them from other amphibians.