oblong toilet bottom

My toilet bowl has oblong channel at the bottom, about 4 inches long. As a result, the plunger does not fit well. Plunging it only stirs it up; it does not seal enough and fails to create pressure to force stuff down. Is there a plunger with an oblong shape that can be purchased?

When I search for 'Plunger for Elongated Toilet Bowls', it just shows plungers that have a round shape. I cannot be the only one that has this problem.

A plunger like this should seal well enough in an oblong opening.
And the narrow extension helps direct the force into the opening.

Search on Google for “force cup bell toilet plunger”

PS If you are getting frequent log jams, try double flushing.

Drop your load, flush, clean up then flush the paper.