When I went to the "Miscellaneous" section of the creative inventory I wanted to try out the new mobs polar bear e.c.t but then I saw existing mob eggs but they were unnamed.

1.Go to the "Miscellaneous" section or go to the search option and write "entity"

2.Highlight your button over the spawn eggs and try to find the "entity.mule.name as an example and if you wrote "entity" in the search bar all the entity eggs will appear and hover your mouse over them and you will see what I mean.