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Yes. Per code and manufacturer installation guidelines for all tile and shingle roofs, the nails must penetrate through the wood sheathing and poke through the inside to have the proper wind rating and strength of hold for the roofing material. So if you see nails poking through the wood sheathing of your roof inside your attic, this is not anything to worry about - it actually means that the roof was installed correctly and has the proper wind rating because the correct length of nails were used.
Additionally, if new plywood is installed, there will also be larger framing nails that you may see. Just like with roof mounting nails, these are also required by code when new plywood sheathing is installed. The framing nails go into the rafters but are also required in the “Field” which is the space in between the rafters. So don't worry, it is perfectly normal and to be expected to have nails poking through inside the attic