An earlier question on pesto gave two invented answers. Another is
Gentleman's Relish, an anchovy flavoured spread that used the mock Latin description 'Patum Peperium,' (also the title of its website) hence patum, and patulum. And yet another invented name could have been added from tapenade, the olive paste from SE France whose root is tapet, tapetia, a carpet, a covering (fr, Greek).
There is also salsa, salsorum, salted foods (Plautus): genuine Latin.
Then there are two spreads: pastes, patées eaten with bread which may be sweet or savoury. Pulmentum seems to be the most appropriate.
pulmentārĭum, ĭi, n. L&S
also pulmentum, i, n. contr. from pulpamentum, from pulpa.
Any thing eaten with bread, a relish (fruit, salt, mustard, etc.)
crĕmor, ōris, m. (kindr. with cremo, (1)) the thick juice obtained from animal or vegetable substances, broth, purée
The most successful spread with an invented Latin name is Margarine, (culinarylore.com)
Margarine was invented in France by Hippolyte Mège-Mouriès in 1869, during the Franco-Prussian wars. He invented it in response to a competitive challenge from the French government under Napoleon III. His product was pale yellow and had a pleasant buttery smell; it was cheaper than butter and lasted longer (It was a manufactured from beef fat)
The name, based on the Latin word for 'pearl,' comes from the small glistening droplets which appeared during the first successful experiments.
[Mège-Mouriès might easily have chosen to derive the name from lino, linere, to smear or daub; and oleum, olive oil, grease. But fortunately, five years earlier that name had been taken, though not registered,...
Linoleum was invented by an Englishman Frederick Walton in 1855; from 1864 he called it Linoleum, which he derived from the Latin words "linum" (flax) and "oleum" (oil).]