Toostie is the pet triceratops of Bubba the Cave Duck. She is a baby dinosaur that behaves much like a puppy and a pony. She first appears in the episode Marking Time (part one of Time is Money). There, Scrooge McDuck, Launchpad McQuack, Huey Dewey and Louie travel back in time and find her and Bubba.
Tootsie made her debut in the five-part DuckTales episode "Time Is Money", when the heroes accidentally go too far back in time. She and Bubba sneak onto the time machine and travel to the present day with Scrooge, Launchpad, Huey, Dewey and Louie. After that, she made recurring appearances in the series.
Tootsie appeared in a few DuckTales comics, often just in cameos.
Bubba actually named her after Launchpad's foot, which he calls his "tootsie".
She bears a striking resemblance to Cera (also a Triceratops) from Land Before Time film franchise, except Tootsie has orange skin, whereas Cera has golden yellow skin.
Even odder, she debuted just 7 days after Cera did.