Is Latvia an LEDC?

No. Latvia is not an LEDC. All LEDCs are located in Sub-Saharan Africa and South Asia (plus Afghanistan) and are considered the worse-off countries in the world.
Latvia is located in northeastern Europe and is a member of the European Union. it' s GDP per capita on average is 20 times higher than in the least economicaly developed countries. Human development index ranks Latvia in 48th place in the world (2009) ahead of countries like Russia, Argentina and Turkey.