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