Patrick Willis has made the most tackles by a rookie, with 136 tackles in 2007.

who has the most solo tackles as a rookie
2007Willis2006Ryans2012David2018Leonard2009Laurinaitis2007Beason2012Kuechly2018Vander Esch2008Mayo2013Ogletree2010Ward2005Morrison2012Freeman2007Harris2018Smith2014Mosley2006Howard2002Cash2013Alonso2012Wagner2013Cyprien2009Cushing2005Rhodes1361261121111081061031021009595919090898888888787868686
NAMESEASONTMGPTKLASTCOMBSCKSCKYINTINT YDSINT TDFFFRFR TD
Patrick WillisPatrick Willis2007SFSF16136381744.09000210
DeMeco RyansDeMeco Ryans2006HOUHOU16126301563.530.51160110
Lavonte DavidLavonte David2012TBTB16112271392.0141270000
Darius LeonardDarius Leonard2018INDIND15111521637.0482380420
James LaurinaitisJames Laurinaitis2009STLSTL16108131212.0152280110
Jon BeasonJon Beason2007CARCAR16106341400.00100010
Luke KuechlyLuke Kuechly2012CARCAR16103611641.042220030
Leighton Vander EschLeighton Vander Esch2018DALDAL16102381400.002560000
Jerod MayoJerod Mayo2008NENE16100281280.00000110
Alec OgletreeAlec Ogletree2013STLSTL1695241191.58.51981600
T.J. WardT.J. Ward2010CLECLE1695281230.002390100
Kirk MorrisonKirk Morrison2005OAKOAK1691251160.00000020
Jerrell FreemanJerrell Freeman2012INDIND1690551452.017141100
David HarrisDavid Harris2007NYJNYJ1690361265.052000210
Roquan SmithRoquan Smith2018CHICHI1689321215.0371220000
C.J. MosleyC.J. Mosley2014BALBAL1688451333.0162230110
Thomas HowardThomas Howard2006OAKOAK1688221100.00000000
Chris CashChris Cash2002DETDET1688131010.001110120
Kiko AlonsoKiko Alonso2013BUFBUF1687721592.0174380120
Bobby WagnerBobby Wagner2012SEASEA1687531402.0113550000
Johnathan CyprienJohnathan Cyprien2013JAXJAX1586171031.001270200
Brian CushingBrian Cushing2009HOUHOU1686471334.030.54260200
Kerry RhodesKerry Rhodes2005NYJNYJ1686201061.010100100
Madieu WilliamsMadieu Williams2004CINCIN1686171032.0193511020
Nick BarnettNick Barnett2003GBGB1586261122.083210010
StatMuse has season-level data for tackles going back to the 2001 season.

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