Favorite toddler learning app or toy

My daughter is 2.5 and I would like for her to be able to use the iPad for learning. Like learning the alphabet, pronouncing words, etc. Or, if there are any good leap frog toys that do the same.

This wouldn’t be for allday, everyday use. I also have a newborn and occasionally need my toddler to be occupied so I can take care of the newborn.