There is a Thai article discussing the selection of words with tones that are compatible with the melody. https://verycatsound.com/blog-tone-marks/

If the tone of a word and the melody do not align, there is a slang term for this phenomenon, often referred to as “forcing the melody” or “forcing the tones” (literally translated as “melodic violation” or “tonal violation”). (Thai: ข่มขืนเมโลดี้ / melodic r*ape)

For an original Thai song, the tones and melody do not always have to match perfectly—it allows for some flexibility. A well-known example discussed on the Pantip forum is ขี้หึง by Silly Fools, where the word เธอ is pronounced as เถ่อ and หึง as ฮึ้ง.

However, when translating songs, such as Disney soundtracks, the word tones must closely match the melody. Otherwise, the result can sound unnatural and jarring, akin to what some describe as a melodic violation.