Board Thread:Questions and Answers/@comment-1362555-20141212225806/@comment-93957-20170728052200

Looks like he was officially denied useage by Nickelodeon

http://www.comicsbeat.com/sdcc17-tmnt-cast-crew-talk-samurai-rabbits-and-series-finale/

" “Nobody wants to see a guy with a carrot for a head,” Nieli said he was told by Nickelodeon."