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