There were two different and unrelated tribal groups in North America referred to as "Blackfeet" or "Blackfoot" by white settlers.
The larger group lived (and still live) in Alberta, Saskatchewan and northern Montana. These were the Blackfoot confederation, made up of the closely-related Blood, Piegan and Blackfoot tribes. They all spoke an Algonquian language (Siksiká or Blackfoot) very distantly related to the languages spoken in the north-eastern United States.
A much smaller group were the Blackfoot Sioux, a division of the Teton Lakotas of the Missouri river in South Dakota. They spoke the Lakota language and today they mainly live at Standing Rock Reservation in South Dakota.
Just to show the differences in their respective languages, here are a few words in Algonquian Blackfoot and the equivalent in Blackfoot Lakota:
Algonquian Blackfoot .................... Blackfoot Lakota ................ English
ahkapi............................................ota.......................................many
ahmoki............................................sha......................................red
sik...................................................sapa....................................black
aapi.................................................ska......................................white
apsi.................................................wahin..................................arrow
omitaa.............................................shunka................................dog
ahkwiniman.....................................canonpa...............................pipe
stomick............................................p'ta.......................................buffalo bull
nahtoya...........................................wakan...................................sacred
ni't...................................................wanci....................................one
niisito...............................................zaptan..................................five
kiipo..................................................wikcemna.............................ten
kaiyo.................................................mahto..................................bear
ahki...................................................win......................................woman
aohkii.................................................mini.....................................water
they speak black feet and kainai.
The Manhasset indians spoke the Munsee and Unami languages.
Sourashtian
Caddoan
I believe they spoke Algonquian
There is no information about languages that were spoken by Tocobaga people.
The Manhasset indians spoke the Munsee and Unami languages.
algonquon
Algonquian!
Sourashtian
Caddoan
Sioux
english.
English, Blackfoot, Crow, Dakota, Salish and Assinboine are languages spoken in Montana.
english.
They spoke Caddoan
Algonqulan Or Algonkian
Iroquian and/or Ojibway