Refers to a small mound made by moles.
El perro cavó un hoyo en la topinera, buscando algo para jugar.
The dog dug a hole in the molehill, looking for something to play with.
Caminé sobre la topinera, lo que me hizo perder el equilibrio momentáneamente.
I walked on the molehill, which made me lose my balance momentarily.