It s called ita buki yane.
Japanese rocks on roof.
Or they can be boats or a living creature usually a turtle or a carp.
In the japanese rock garden rocks sometimes symbolize mountains particularly horai the legendary home of the eight immortals in buddhist mythology.
Rocks on the roof savannah.
In a group they might be a waterfall or a crane in flight.
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Another of the repercussions of the invention of the hidden roof was the role change undergone by struts called nakazonae 中備 中具.
Rocks and stones are just weights to protect the shingles from wind.
They make the trellises by erecting some posts in the ground then make the top extending the ends of woods outside the beam in cone or sharp edges.