Primosaur

The group of  'Yellow avatars' have been speculated by users to be the new avatars which will get named in couple next Avatar Naming Contests. They may also be named by the staff of Khan Academy. There has not yet been an official confirmation that these will be avatars yet or their names.

Stage 1
It's a round, yellow seed with eyes. It looks like a yellow rain drop.

Stage 2
It looks like the first version, just with a leaf on its head and legs beginning to sprout extra.