the third pic showing 'crypts in waterfall' seems to show java fern instead. The submerged long leafed plants at Khao Sok are probably Crypt. crispatula var. balansae... the emmersed heart shaped plants are likely to be some Alocasia or Homalomena sp. (which belong to the same family as Anubias and Crypts, and also like to grow in marshy soil).