We don't have synonyms for indigen yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are indign, indogen and indigeen.
"1975: I liked the streets best, so I walked and stared, and slept in a Salvation Army hostel for indigents. But I was no indigent; I was rich in feeling, and that was a luxury I had rarely known. -- Robertson Davies, World of Wonders"
"1975: I liked the streets best, so I walked and stared, and slept in a Salvation Army hostel for indigents. But I was no indigent; I was rich in feeling, and that was a luxury I had rarely known. -- Robertson Davies, World of Wonders"