A literal toddler is one who can read.

I'm reminded of a Simpson's episode where Arnold Shwarzenegger is elected as President, given 5 stacks of papers with briefs of options, and he picks one at random without reading it saying "I was elected to lead, not to read!"

To get excessively pedantic, he walks very poorly. Toddles around. So his gait makes him a literal toddler. All 1 & 2 year olds toddle, but not all who toddle are 1 or 2 years old.