can a single text file hold 2 or more frames to be recognized during hex dump import

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Yes. From the text2pcap man page:

Text2pcap is a program that reads in an ASCII hex dump and writes the data described into a capture file. text2pcap can read hex dumps with multiple packets in them, and build a capture file of multiple packets.

Wireshark itself supports the same thing from "File -> Import from Hex Dump...".