...since no MSU quarterback has ever thrown for more than 16 in a season.
In fact, only five have thrown more than eleven in a season:
1. Derrick Taite (1995) - 16 TD
2. Don Smith (1985) - 15 TD
3. Derrick Taite (1994) - 14 TD
3. Kevin Fant (2003) - 14 TD (thank YOU, Odell Bradley!)
5. Tony Shell (1988) - 13 TD
6. Four tied with 11 (Tommy Pharr, 1969; Dave Marler, 1978; Todd Jordan, 1993; Wayne Madkin, 1998)
10. Four tied with 10 (Fant, 2002; Madkin, 1999; Shell, 1990; Smith, 1986)
So given your near-complete lack of research, no I don't think Wes Carroll will have 20 TDs.