Yes, the TRAP-TYPE is parsed and accessible in Mibble. But in SMIv1, the traps aren't assigned to OIDs, so they are a bit more tricky to find. Basically you search for them with their numeric value ("1", "2", etc):
mib.getSymbolByValue("1")
Or you can find the traps by iterating over all MibValueSymbol instances, filtering out the symbols with a type that is instanceof SnmpTrapType.
You can always inspect the parsed results by using the MibblePrinter utility (which pretty-prints the parsed MIB). A small example for RFC1382-MIB: