The present tense of swallowed something hook, line and sinker is swallow something hook, line and sinker.

The third-person singular simple present indicative form of swallow something hook, line and sinker is swallows something hook, line and sinker.

The present participle of swallow something hook, line and sinker is swallowing something hook, line and sinker.

The past participle of swallow something hook, line and sinker is swallowed something hook, line and sinker.