knoll

"The children rolled down the knoll, giggling all the way."

"We set up our picnic on a grassy knoll overlooking the lake."

"From the top of the knoll, we could see the entire valley."

"They knolled the sand to create a small dune on the beach."

"The gardener knolled the soil to improve drainage."

"He knolled the hay into small hills for the animals."