Frank J. Wilstach, comp. A Dictionary of Similes. 1916.

Gape

Gaping mouth wide open like a dying codfish.
—Anonymous

Gape as it were dogs for a bone.
—Alexander Barclay

Mouths that gap’d like bung-holes.
—Beaumont and Fletcher

Gape like an oyster.
—Beaumont and Fletcher

Gaping like an indolent lion.
—James Fenimore Cooper

Gapes like a sheriff for execution.
—John Day

Gape wider than an oyster-wife.
—Thomas Dekker

Like dead heaps of fishes, stranded by the storm-spray, gaping, staring.
—Alfred Domett

Gaped, like the griesly mouth of hell.
—Edmund Spenser

Gaping like a stuck pig.
—Jonathan Swift