A lambiscón is a person who flatters someone to win a favor or a privilege. The Diccionario del español de México of El Colegio de México illustrates the word with an office scene. A lambiscona types on her laptop and pretends not to want to miss a single remark from her boss.
A barbero, a barber, is also a flatterer. Hacerle la barba a alguien, “to do someone’s beard,” means to praise someone or behave servilely to get something from that person. The dictionary gives two examples. One is a student who wants to pass a course by flattering his teachers. The other is hacerle la barba al jefe, “to do the boss’s beard.”