What species are the feeder Bullfrogs in Singapore?

[Soulmates]

I was at C328 and the Bullfrogs seems somehow different and cuter. They have a whiter tummy and more olive green back (Not those small ones that can stick to surface, the larger ones) and thought they were superbly cute.

(Just finding that Shrimps are so hard to take care of and I have experiences with keeping frogs so maybe I'll be looking at those cute Bullfrogs to keep or GTF).