  Large-field inflation is a major class of inflation models featuring a near-
or super-Planckian excursion of the inflaton field. We point out that the large
excursion generically introduces significant scale dependence to spectator
fields through inflaton couplings, which in turn induces characteristic
distortions to the oscillatory shape dependence in the primordial bispectrum
mediated by a spectator field. This so-called cosmological collider signal can
thus be a useful indicator of large field excursions. We show an explicit
example with signals from the "tower states" motivated by the swampland
distance conjecture.
