Mark Clayton had the most receiving touchdowns by a player in a season in his first 2 seasons, with 18 touchdowns in 1984.

who has the most rec td in a first 2 season
1984Clayton2011Gronkowski1998Moss1961Groman1986Rice1960Randle2015Robinson1960Powell2015Beckham2004Gates1995Bruce1985Turner1983Quick1978Jefferson1966Hayes1963Collins1952Howton2014Beckham2014Evans2008Johnson2007Jennings1989Sharpe1985Lipps1817171715151414131313131313131313121212121212
NAMESEASONTMGPREC TDRECTRGREC YDSAVGREC YDS/GRUSH YDSATTYPCRUSH YDS/GRUSH TD
Mark ClaytonMark Clayton1984MIAMIA1518731,38919.092.635311.72.30
Rob GronkowskiRob Gronkowski2011NENE1617901241,32714.782.9212.00.11
Randy MossRandy Moss1998MINMIN1617691,31319.082.1414.00.30
Bill GromanBill Groman1961HOUHOU1417501,17523.583.9212.00.11
Jerry RiceJerry Rice1986SFSF1615861,57018.398.172107.24.51
Sonny RandleSonny Randle1960STLSTL12156289314.474.4000.00
Allen RobinsonAllen Robinson2015JAXJAX1614801511,40017.587.5000.00
Art PowellArt Powell1960NYTNYT1414691,16716.983.4000.00
Odell Beckham Jr.Odell Beckham Jr.2015NYGNYG1513961581,45015.196.7313.00.20
Antonio GatesAntonio Gates2004SDSD15138111496411.964.3000.00
Isaac BruceIsaac Bruce1995STLSTL16131191,78115.0111.31735.71.10
Daryl TurnerDaryl Turner1985SEASEA16133467019.741.9000.00
Mike QuickMike Quick1983PHIPHI1613691,40920.488.1000.00
John JeffersonJohn Jefferson1978SDSD1413561,00117.971.5717.00.50
Bob HayesBob Hayes1966DALDAL1413641,23219.388.0-11-1.0-0.10
Gary CollinsGary Collins1963CLECLE14134367415.748.1000.00
Billy HowtonBilly Howton1952GBGB1213531,23123.2102.6000.00
Odell Beckham Jr.Odell Beckham Jr.2014NYGNYG1212911301,30514.3108.83575.02.90
Mike EvansMike Evans2014TBTB1512681231,05115.570.1000.00
Calvin JohnsonCalvin Johnson2008DETDET1612781501,33117.183.2-13-0.3-0.10
Greg JenningsGreg Jennings2007GBGB1312538492017.470.8000.00
Sterling SharpeSterling Sharpe1989GBGB1612901,42315.888.925212.51.60
Louis LippsLouis Lipps1985PITPIT1612591,13419.270.91628.01.01
Gene WashingtonGene Washington1970SFSF1312531,10020.884.6000.00
Bob HayesBob Hayes1965DALDAL1312461,00321.877.2-84-2.0-0.61
StatMuse has season-level data for receiving touchdowns going back to the 1921 season.