In this post we have lots of free PDFs for this song, including melody, chords, fingerpicking and fingerstyle. You can find more like this in my ebook Easy Songs in the Public Domain for Fingerstyle Ukulele.
Fingerpicking Accompaniments
Uke-Fingerpicking_Twinkle Twinkle Little Star
Uke-Thumb-Pinch-Finger-Pattern_Twinkle Twinkle Little Star
Fingerstyle Ukulele Arrangement
Uke-Fingerstyle_Twinkle Twinkle Little Star
Simple Melody and Chords Arrangements
Uke-Chords_Twinkle Twinkle Little Star
Uke-Melody_Twinkle Twinkle Little Star
Uke-Melody-and-chords_Twinkle Twinkle Little Star
These melody arrangements should also work for Violin, Sax, Clarinet and Flute.
Violin_Twinkle Twinkle Little Star
Alto Sax_Twinkle Twinkle Little Star
Clarinet_Twinkle Twinkle Little Star
Flute_Twinkle Twinkle Little Star