Oobi Letters is an online game released to Noggin.com. It was available on the site from 2003 until 2009. It was later released to NickJr.com and was playable until 2015.
"You can count on Oobi to give you a hand recognizing letters. Oobi will name an object that begins with a certain letter—and stresses the strong sound of the initial letter. Oobi repeats the sound and the word that begins with that sound. Oobi then gives two possible answers. You'll look at the possibilities and click on the object that starts with the same initial sound. Get it right and win a star! Get three stars and you win the game. Play as often as you like!"
"Oobi Letter game! Oobi gives you the letter - you choose which word begins with the letter! Just like on TV.