Is landed a pronoun

No, the Word 'landed' is the past participle, past tense of the verb to land. The past participle of the verb also functions as an adjective, used to describe a noun.

The Word land is also a noun, a Word for the part of the earth's surface that is not covered by water; a Word for a country; a Word for a thing or a place.

A pronoun is a Word that takes the place of a noun in a sentence. The pronoun that takes the place of the noun 'land' is it.

Examples:

Apollo 11 landed on the moon on July 20, 1969. (verb)

Media moguls John Malone and Ted Turner are the top landed gentry in the US. (adjective)

The land to build the hospital was donated. (noun)

It was a gift to the community from the O'Hara estate. (the pronoun 'it' takes the place of the noun 'land' in the previous sentence)