Trotsky lived in LATAM during exile. As such, Trots exist in LATAM more frequently than in other global south regions.

LATAM Marxists aren't a classification, what I mean is Marxist orgs that exist in LATAM. Regarding the specific lines, we have MLs, trots, maoists, hoxhaists, postmodern marxists, liberation theologians, and others.

A curiosity about some LATAM currents, the Posadist tendency is originally from a Trot org based on Argentina.

But LATAM has been an intense battlefield of Marxists orgs/tendencies vs reactionary forces and we had guerrillas and civil wars basically everywhere in the 20th century. The PC do B from Brazil took part in the "Guerrilha do Araguaia", MR8 and other armed resistance movements. Dilma Rousseff, ex president, was also a guerrilla fighter. Gustavo Petro, recent president of Colombia, also participated in the M-19 guerrilla. Argentina had the Montoneros and Uruguay the Tupamaros. However, not all guerrillas were Marxist, and there were many other liberal tendencies in those as well.

Edit: but the problem is that, after the fall of the USSR, many parties split, many parties and leaders became revisionist, and the remaining ML/Trot parties became insignificant, dogmatic or sectarian.