This is a smaller one

Looks more like an Alocasia or Colocasia - sometimes a little harder with smaller ones as the juvenile leaves may be different from an adult plant.

Does it have a bulb?

It does have a bulb, yes.

It's not a Philodendron then. Are there stripes/spots on the petioles? I don't know what it is, but that should be a clue.

Maybe it is Alocasia odora, which has speckled stems like yours.

Here is a link that might be useful: {{gwi:160209}}

It does have black specks on the petioles! How big do these things grow?