I’ve mentioned before that my grandson (then 6 years, 9 months, but now 6 years 11 months) regularly uses ‘ated’ as the past tense of the verb eat. https://languagemiscellany.com/2022/05/learning-to-eat-in-the-past
I forgot to say that he also regularly uses ‘aten’ as the past participle of that verb. And over the last couple of weeks I’ve also heard his brother (4 years, 6 months) and cousin (4 years, 3 months) also using the form ‘aten’ as the past participle.