Correct spelling for the English word "swollened" is [swˈə͡ʊlənd], [swˈəʊlənd], [s_w_ˈəʊ_l_ə_n_d] (IPA phonetic alphabet).
There is no such word as "swollened" in the English language. It appears to be a misspelling or a non-standard variation of the word "swollen".
The word "swollen" is the past participle of the verb "swell", which means to become larger or to increase in size. The etymology of "swell" can be traced back to the Old English word "swellan", which shares the same meaning. The Old English word itself derives from the Proto-Germanic root "swel-" meaning "to be swollen".
So, "swollen" originates from Old English and has connections to the Proto-Germanic language.