This reaction involves an initial nucleophilic addition by a hydroxide group, resulting in its namesake tetrahedral intermediate, which then reacts with another molecule of reactant in a disproportionation step.  
The Tischenko reaction is one of its variants, in which use of an alkoxide instead of hydroxide as the catalyst results in the formation of an ester.  In the "crossed" variety of this reaction, excess formaldehyde is used to increase the yield of one of the products.  This reaction involves an initial nucleophilic addition by a hydroxide group, resulting in its namesake tetrahedral intermediate, which then reacts with another molecule of reactant in a disproportionation step.  FTP, name this reaction whereby carboxylic acids and alcohols are formed from aldehydes, which is named for an Italian chemist.
The Tischenko reaction is one of its variants, in which use of an alkoxide instead of hydroxide as the catalyst results in the formation of an ester.  
Cannizzaro reaction