Yes, of course, but they are less than 1% of the Brazilian population, and they mostly live in the Amazon jungle, not Texas.
99.999999999% of the Brazilians who come to the US are either white, black, or a black/white mixture. They do not look like the average Mexican; the only confusion may occur among whites, irrespective of whether they are from Mexico, Germany or Brazil.
Brazillian are mistaken for Mexicans by ordinary people all the time.
Still false.