Is monggo a soy bean

They are both legumes but they are in completely different geni, soybean (Glycine max) is from the Glycine genus, and mung bean (Vigna radiata) from the Vigna genus, both of which are different from the traditional bean (Phaseolus genus).

The confusion came from the fact that sprouted mung beans were at times sold as "soybean" sprouts. Mung beans used for bean sprouts have a green skin, while the soybean, which is about twice bigger, is white or yellow.