I picked up a number of these models, usually second hand and costing no more than £1.50 each. Then once back in the UK I glued them together, re-based and painted them.
I am sure that a collector could tell you exactly what monster each of these represents, but to me they are just opponents for my 40mm Flash Gordon miniatures.
The first is a winged lizard creature that came in parts and is based on a 40mm round base. I have painted it in the same colours as the original.
Others in the 'Thailand collection' include a Lizardman/Lizard Monster - see above and based on a 50mm round base and some Fantasy Samurai that I intend painting as statues!
I also picked up a number of Thai and Japanese modelling magazines, which although I cannot read, do have some fantastic picture articles, particularly Mecha and Transformer models.