One of the most important defining morphological features of the eudicots is the presence of pollen grains having three, long, grooved apertures or openings, and in recognition of that fact, the eudicots are also known as the tricolpates.
Tickle Me Elmo was released in July 1996, with a supply of 400,000 units. The dolls sold well, but remained widely available until the day after Thanksgiving, when they suddenly sold out. With the Christmas shopping season approaching, Tyco Preschool ordered 600,000 more dolls from their suppliers.
I'd predict Caroly Wilcox built, or at least supervised the building of Elmo. The puppet that became Elmo appeared on the show since the 1970s, and Wilcox supervised the Muppet Workshop for Sesame Street until retiring in 1990. If you're talking about who created the personality of Elmo, that would be Kevin Clash. He has voiced and performed Elmo since his debut in 1985 until 2012.