Spanish language

The use of the pronoun vos with the verb forms of tú (e.g. vos piensas) is called “pronominal voseo“. And conversely, the use of the verb forms of vos with the pronoun tú (e.g. tú pensás or tú pensái) is called “verbal voseo“.
In Chile, for example, verbal voseo is much more common than the actual use of the pronoun vos which is often reserved for deeply informal situations.

Distribution in Spanish-Speaking Regions of America

The voseo pronoun is used in Central America’s Nicaragua.

Although vos is not used in Spain, it occurs in many Spanish-speaking regions of the Americas as the primary spoken form of the second-person singular familiar pronoun, although with wide differences in social consideration.