Useful suggestions from PhilP.
Argilla, what code of rail are you using? 200, 250, 332? Where in the world are you?
I've never built my own pointwork in G scale, but I did make my own replacement brass frogs for LGB R5 turnouts.
If using code 250 or code 332 (standard LGB profile) then there appear to be some frogs here:
http://www.randkrailroadproducts.co...ath=70&zenid=03d868909fc1f3deffe32ccae469ddad < Link To http://www.randkrailroadp...c1f3deffe32ccae469ddad
Heyn Modelbau could be another source. Possibly suppliers such as Llegas Creek? I'm mentioning these firms purely from having heard of them - I have no experience of them. There may be other suppliers.
I think Peco supply components for their code 250 trackwork.