https://www.merriam-webster.com/dictionary/ladel
https://www.dictionary.com/browse/ladel
https://www.collinsdictionary.com/us/spellcheck/english?q=la...
OED has it as an incorrect/unusual variant:
https://www.oed.com/search/dictionary/?scope=Entries&q=ladel
It's misspelled constantly on the internet, but "ladle" is the correct spelling.