Are these Philodendron giganteum?

I found them growing on a wild beach in a rainforest area Paraty, Brazil.
Could they be P.giganteum?

Thank you!
Myriam

 

Hi Myriam! Leland Miyano, a real Philodendron expert, has sent me this note:

 

Hi Iorax,

Thank you so much for being so helpful, it is very much appreciated! Please send my thanks too to leland Miyano!

Myriam :-)