Hi Mike,,
What info are you after?? What info do you have that leads you to search for Thomas?? That may give me enough info to find the 1 you are looking for.

Maybe some of the info below will give an idea for dates/areas etc.

FROST, Thomas. Per "Baring", 1819
1819 Jul 3
On list of convicts disembarked from the "Baring" and forwarded to Parramatta for distribution (Reel 6006; 4/3500 p.162)

1822 Apr 1
Servant to Payton. On return of proceedings of the Bench of Magistrates, Parramatta (Fiche 3297; X643 p.7)

1824 Mar 1,2
Re permission to marry at Sydney (Reel 6012; 4/3510 p.423)
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COF
FROST Thomas Baring 1819 009/4581 3 Nov 1825 4/4424 602
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FROST, Thomas. Per "Indian", 1810; settler of Evan and Bathurst
1820
Memorial (Fiche 3019; 4/1824A No.264 pp.37-8)

1821 Mar 24
Store receipts of for wheat (Reel 6051; 4/1748 p.155)

1821 Nov 28; 1822 Feb 13
Memorials (Fiche 3046; 4/1829 Nos. 129A-B). Reply, 16 Jul (Reel 6009; 4/3506 p.66)

1822
Signatory to memorials of settlers at Bathurst praying that their grants be confirmed without alteration and that some forest ground be located as a common (Reel 6065; 4/1798 pp.123, 127)

1822 Aug
Signatory to petition objecting to the Commissariat's new system of paying for supplies in Spanish dollars (Reel 6017; 4/5783 p.124d)

1823 Oct 25
Convict assigned to by Bench of Evan (Reel 6028; 2/8283 p.163)

1823 Oct 27
Re employment history and conduct of Owen Kelly per "Prince Regent", 1821; was Kelly's second master (Reel 6017; 4/5783 p.476)

1824 Sep
Memorial (Fiche 3088; 4/1837A No.361 pp.401-2)

1825 Jan 17
Memorial (Fiche 3132; 4/1841B No.294 pp.861-4). Reply, 21 Feb (Reel 6014; 4/3513 p.457)

1825 Feb 21
On list of persons who have received orders for grants of land (Fiche 3266; 9/2652 p.90)

1825 Apr 26
Signatory to a memorial by magistrates, settlers and stockholders of the District of Evan praying that the common near Castlereagh, recently given to Captain King on a ticket of occupation, be returned to its former purpose (Reel 6017; 4/5782 pp.299-301)
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Convict Pardon
FROST Thomas - Indian 1810 - CP 5 Jun 1815 [4/4430] 774 - 090
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FROST, Thomas. Per "Minerva", 1824

1824 Nov 24
On list of convicts landed from the "Minerva" and forwarded to Windsor for distribution (Reel 6014; 4/3513 p.20)
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Convict Pardons
FROST Thomas - Minerva 1824 47/269 CP 10 Apr 1847 [4/4451] 783 - 37-38
FROST Thomas - Minerva 1824 47/269 CP 10 Apr 1847 [4/4451] 783 - 37-38
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TOL
FROST Thomas - Minerva 1824 42/0861 10 Sep 1842 39/1119 [4/4247] 970 On the recommendation of Berrima Bench

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FROST, Sarah. Born in the Colony; wife of Thomas Frost of South Creek

1824 Aug 23
Memorial (Fiche 3088; 4/1837A No.360 pp.399-400). Reply, 16 Sep (Reel 6013; 4/3512 p.375)
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CSreLand
2/7862 1129 FROST Thomas 1826 1855 of Penrith
2/7862 1129 FROST Thomas 1846 1846 of Parramatta
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Marriages
V18243327 3B/1824 FROST THOMAS CAPP ELIZABETH
Church of England Sydney, St Phillip's

V18151742 3A/1815 FROST THOMAS ROPE SARAH
Church of England Castlereagh
V184423 60/1844 FROST THOMAS ROPE SARAH
Israelite Penrith

V1848655 78/1848 FROST THOMAS COLEMAN CAROLINE
Presbyterian Sydney, St Andrew's Scots Church

V1843356 27C/1843 FROST THOMAS O'BRIEN MARY
Church of England Berrima, Bong Bong, Sutton Forest, All Saints (Co. Camden

Hope the above areas and dates give you something to go on,,,If you narrow it down let me know and we can concentrate on what you have.

Kellie