I'm sure everyone's toddler/preschooler makes up words based on prefixes, suffixes, etc. of words they already know. My favorites of Emberly's are "tomorning" and "tolater." Which, seriously, why aren't they words?
And maybe by tomorning I'll can remember a whole list of words that she should be submitting to Webster.
Made-up words are way cuter than 4-going-on-14 speak at least. For sure.