Dwight Howard had the most games by a player younger than 20 with 10+ rebounds, with 57 games.

Interpreted as:

most 10 or more rebound regular-season games before turning 20 years old by a player

	NAME	GP	REB	MPG	PPG	RPG	APG	SPG	BPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	TS%	OREB	DREB	TPG	MIN	PTS	AST	STL	BLK	TOV	PF	+/-
1	Dwight Howard D. Howard	57	761	34.8	13.8	13.4	1.2	0.9	1.9	5.2	9.8	52.9	0.0	0.1	0.0	3.4	5.5	63.0	56.5	4.2	9.1	2.4	1,984	788	69	52	106	134	172	+1
2	Jalen Duren J. Duren	33	427	28.8	12.6	12.9	1.8	0.9	1.1	5.4	8.1	67.0	0.0	0.1	0.0	1.8	2.8	63.7	67.7	4.6	8.4	2.1	949	416	59	29	37	68	98	-65
3	Andre Drummond A. Drummond	20	237	24.4	10.1	11.9	0.7	1.3	2.0	4.4	7.4	59.5	0.0	0.0		1.3	3.7	35.1	55.9	4.4	7.5	0.9	487	202	14	26	39	18	58	+1
4	Jabari Smith Jr. J. Smith Jr.	19	219	34.6	15.3	11.5	1.8	0.8	1.1	5.3	12.9	41.2	1.6	5.2	31.6	3.0	3.8	79.2	52.4	2.8	8.7	0.9	658	290	34	16	21	18	51	-53
5	Anthony Davis A. Davis	17	201	33.3	15.6	11.8	1.4	1.1	2.1	6.5	12.8	51.2	0.0	0.2	0.0	2.5	3.9	65.2	53.9	3.8	8.0	1.8	565	265	23	18	35	30	39	-60
6	Josh Giddey J. Giddey	16	188	32.8	12.4	11.8	7.3	0.6	0.3	5.3	13.1	40.7	0.8	3.0	27.1	1.0	1.4	72.7	45.5	2.9	8.9	3.8	525	199	117	10	4	60	22	-41
7	Josh Smith J. Smith	16	179	34.8	13.5	11.2	1.9	0.8	2.3	5.0	11.1	44.9	0.1	0.8	16.7	3.4	4.9	68.4	50.8	3.3	7.9	2.1	557	216	31	13	37	33	42	-74
8	Victor Wembanyama V. Wembanyama	15	197	30.6	19.3	13.1	2.8	1.6	3.4	7.1	16.8	42.5	1.4	4.8	29.2	3.7	4.6	79.7	51.4	2.9	10.2	3.1	459	290	42	24	51	47	40	-54
9	Chris Bosh C. Bosh	15	180	37.3	12.3	12.0	0.8	1.0	1.1	4.5	11.2	40.5	0.0	0.1	0.0	3.2	5.6	57.1	44.9	4.3	7.7	1.7	559	184	12	15	16	26	42	+31
10	Dereck Lively II D. Lively II	13	158	31.0	12.7	12.2	1.9	0.5	1.3	5.6	6.9	81.1	0.0	0.0		1.5	3.0	48.7	77.0	4.2	8.0	1.8	403	165	25	7	17	23	42	+105
11	Isaiah Stewart I. Stewart	13	158	26.0	11.4	12.2	1.1	0.9	1.9	5.1	7.8	64.7	0.2	0.5	42.9	1.0	1.5	65.0	66.8	4.2	7.9	1.8	338	148	14	12	25	23	42	+56
12	Marvin Bagley III M. Bagley III	13	154	30.9	18.6	11.8	1.8	0.7	1.2	7.2	14.5	50.0	0.2	1.6	14.3	3.9	5.5	71.8	55.2	4.1	7.8	1.4	402	242	24	9	15	18	30	+22
13	Luka Dončić L. Dončić	13	138	33.0	22.1	10.6	7.6	0.4	0.3	7.2	17.7	40.4	2.5	7.8	32.7	5.2	7.0	74.7	53.1	1.5	9.2	3.8	429	287	99	5	4	50	22	+22
14	Kevin Garnett K. Garnett	13	161	37.4	13.6	12.4	2.5	1.2	2.0	6.3	11.8	53.2	0.0	0.3	0.0	1.0	1.6	61.9	54.2	3.5	8.9	1.5	486	177	32	16	26	19	41
15	Anthony Randolph A. Randolph	12	145	28.0	12.5	12.1	1.1	1.3	2.0	5.3	11.1	48.1	0.0	0.0		1.8	2.2	84.6	51.9	4.2	7.9	1.7	336	150	13	16	24	20	39	-7
16	Andrew Bynum A. Bynum	12	145	32.3	12.9	12.1	1.8	0.2	2.8	4.8	8.3	58.0	0.0	0.1	0.0	3.3	4.9	66.1	61.5	3.3	8.8	1.6	387	155	21	2	33	19	38	+24
17	Darius Miles D. Miles	12	130	34.3	14.7	10.8	2.0	1.0	1.8	6.2	11.8	52.1	0.0	0.2	0.0	2.3	4.6	50.9	52.9	3.2	7.7	2.0	411	176	24	12	21	24	39	+32
18	Bismack Biyombo B. Biyombo	11	129	31.8	8.9	11.7	0.7	0.5	3.3	3.5	6.5	52.8	0.0	0.0		2.0	3.8	52.4	54.2	3.6	8.1	1.5	350	98	8	6	36	16	35	-23
19	Carmelo Anthony C. Anthony	11	125	35.9	18.5	11.4	2.6	1.8	0.5	6.7	18.5	36.3	0.5	2.9	18.8	4.5	6.1	73.1	43.5	4.8	6.5	3.8	395	203	29	20	6	42	37	-49
20	LeBron James L. James	11	124	43.4	27.1	11.3	5.5	2.2	1.3	10.6	20.2	52.7	1.1	3.1	35.3	4.7	6.0	78.8	59.4	2.0	9.3	3.9	477	298	61	24	14	43	12	+64
21	Alex Sarr A. Sarr	10	114	28.5	14.6	11.4	2.9	0.2	1.3	5.6	14.0	40.0	1.4	4.9	28.6	2.0	3.3	60.6	47.2	3.0	8.4	1.8	285	146	29	2	13	18	18	-55
22	Tracy McGrady T. McGrady	10	118	29.6	13.6	11.8	2.7	0.8	1.6	5.6	12.2	45.9	0.0	0.5	0.0	2.4	3.9	61.5	48.9	5.4	6.4	1.9	296	136	27	8	16	19	24	+13
23	Wendell Carter Jr. W. Carter Jr.	9	104	29.1	12.2	11.6	1.6	0.9	2.0	4.8	9.4	50.6	0.2	1.2	18.2	2.4	2.6	95.7	57.8	2.9	8.7	2.3	262	110	14	8	18	21	29	+4
24	Eddie Griffin E. Griffin	9	102	39.0	15.7	11.3	1.3	0.3	3.6	5.7	13.6	41.8	2.3	5.9	39.6	2.0	2.8	72.0	53.0	3.3	8.0	1.1	351	141	12	3	32	10	19	+4
25	Alperen Sengun A. Sengun	8	96	28.8	15.3	12.0	3.3	1.1	1.0	6.0	11.4	52.7	0.6	2.4	26.3	2.6	3.4	77.8	59.3	4.0	8.0	1.9	230	122	26	9	8	15	22	-46