Here's what rhymes with whiptail.
pale tail tale jail bail bale dale pail detail male fail mail sale sail trail nail rail veil gale hail shale whale stale vale wail hale braille kale impale faille wale scale avail entail frail email assail curtail inhale quail snail flail quale bewail derail pigtail topsail grail bobtail hightail prevail travail ponytail unveil taffrail wassail pellmell carrell exhale gunwale mainsail foresail monorail swallowtail lugsail fingernail countervail martingale nonpareil hangnail tattletale