A footnote points out that while popular tradition has it that a whale swallowed Jonah, the text identifies the beast as merely a "fish."

But she comforts herself later since it was God's order to swallow Jonah.

Well, the whale swallowed Jonah, and she swallowed them; and they all went down, the whole lot of 'em, poor fellers!'

Rolf, what fish did swallow Jonah?

A big fish or whale (of unspecified species) did indeed swallow Jonah.

In another publication he also noted that "the whale shark is not the fish that swallowed Jonah."

The cruising cab had gulped The Shadow like the whale that swallowed Jonah.

A great sea creature sent by God, swallows Jonah.

The Pirates attempt to reel him back in, but a whale swallows Jonah.

The pain has swallowed her as the whale reputedly swallowed Jonah, that holy draft-dodger.