Troikas

Troikas are a set of non-talking five plastic egg-shaped toys in the style of a Matryoshka doll with a picture of five animals: bulldog (largest), cat (second largest), duck (medium), goldfish (second smallest) and ladybug (smallest). Troikas are based on Little Tikes' Nested Farm Animals.

Toy Story
The Troikas were first seen when Slinky was gathering everyone together for a staff meeting.

Toy Story 2
They were also seen in Toy Story 2 when Buster comes into Andy's room and knocks them over. Buzz later says their name during an emergency roll call.

Toy Story 3
None of the five Troikas appear in Toy Story 3. They were probably sold at a yard sale, thrown away donated or handed down to Molly between Toy Story 2 and Toy Story 3. It is also a possibility that Andy put them in the attic.

Trivia

 * The Troikas appeared in Guess Who, an episode from Toy Story Treats, but without the goldfish.
 * All five of the Troikas appear in Toy Story Mania! (Video Game) opening scene in 2009.
 * The Troikas appear on some of the Buzz Lightyear of Star Command intros.