The correct name for the compound Sn(NO2)2 is Tin(II) Nitrite.
To break it down, Sn represents tin, and in this compound, tin has a +2 oxidation state, which is indicated by the (II) in the name. The NO2 is the nitrite ion, which carries a -1 charge. Since there are two nitrite ions in the formula, they balance out the +2 charge of the tin ion. Thus, the complete name summarizes both the metal’s identity and its oxidation state, along with the anion derived from nitrous acid.