ISDAMBITUIN

This is a coined word.

isda
fish

bituin
star

isdang-bituin 
star-fish

isdambituin
starfish

bituin-dagat
fish-star

Most Filipinos simply use the English word “starfish.”

The Constitution of the Philippines states that the nation has two official languages -- these are called English and Filipino. Tagalog is the basis of the Filipino language.