1. The act of entering or going into; ingress; as, the entrance of a person into a house or an apartment; hence, the act of taking possession, as of property, or of office; as, the entrance of an heir upon his inheritance, or of a magistrate into office.
4. The entering upon; the beginning, or that with which the beginning is made; the commencement; initiation; as, a difficult entrance into business. Beware of entrance to a quarrel. St. Augustine, in the entrance of one of his discourses, makes a kind of apology. (Hakewill)
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"Sinking" only applies if frogs were upright bipeds. There may be a slight prevention of mixing, due to the offset entrances, but it's not that critical. Also, most frogs don't get oxygen just from their lungs...
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