Since the genesis of the Thai language is far more intimately connected with South Asian and East Asian languages, there are far fewer 'friends', false or otherwise, found between the languages of Thai and English than are found between Indo-European languages.
Thailand's official language is Thai as spoken and written in Central Thailand. Variants on this form are found as one moves from North to South in particular, where both vocabulary and tone values can vary.
In Thai the meaning of a syllable can vary depending on which of five tones is used to pronounce it. In central Thai there are five tones used: low, mid, falling, high and rising.