I’m pretty much thinking that you could take all the native Caddoan speakers and get them in one room. Spanish, not so much.
The following tribes speak Caddo:
Arikara -in the Dakotas
Pawnnee
Wichita
Kitsai
The population of Caddo tribes speaking Caddoan
in Texas alone is 5,000.
Other states, LA,OK, SD, ND, AR, etc. also have Caddoan-speaking populations.